Damon and I were discussing this the other day - about how the Pagan and Witchy communities could definitely take a leaf out of the Christian community book and hire pagans when they need a service done or product made. I remember distinctly how the Christian churches I belonged to either worked within itself - need your computer fixed? Hire the Deacon who also has an IT business! - or they hired businesses that had "Christian values." 

Some pagans might feel that it is the purpose of the pagan community to be different from the christian community, however, my point here is there is a reason to christian community is larger and has more influence in our society. While we aren't necessarily competing with this community, we should consider our own growth, strengthening, and development.

Supporting other pagans should be something we do to better ourselves and our community. 
What do I mean by taking our business to other pagans? 
I don't just mean occult shops, tarot readers, and other metaphysical businesses. 

Witchvox had an article years ago Why Pagan Shops Fail and How Some Succeed. In the article, Pennanti explains that many occult industry businesses are failing not because Pagans don't want to buy from Pagan's but because there aren't Pagan Businesses that are meeting the needs of the community. "There’s a level of entitlement in the pleas to buy Pagan – that they deserve it just because they’re Pagan. Stores aren’t charity, though, and I shouldn’t feel obligated to toss money at people selling stuff I don’t need. What do I need? What do Pagans need? I would love to see, say, a hardware store that was Pagan owned. A craft supply store. A garden store."

I suggest that when we need any business done, we should consider local and we should consider pagan. If you need catering for an event, ask the kitchen witch with the catering business. If you need website design, ask the druid that is also a computer and graphic design wiz. Want to hire a baby sitter or tutor for your kids, consider the young witch that helped out at the pagan community park clean up. 

Now, I'm not saying that you should lower the bar for a Pagan Business - if they aren't as good as the Jewish, Christian, or Atheist business around the corner, then, by all means, go where you will get the best service. All we're saying is to make community part of your consideration. 

We also are active on Facebook Pagan Business communities: 
Pagan Business Network_
Pagan Business Networking

I get this question, in various forms, quite often, especially when reading at events. 
Before I go on to giving my answer, let me please say there is no Right answer or One True answer to this question. Each tarot reader might have a different opinion and it really is all about you and what you are comfortable with. 

I know of at least one tarot reader who feels it is absolutely necessary for the clients to touch the deck. She feels that this connects the client's energy to the cards and that the next client that chooses that deck, they choose the whole package - energy, cards, message, and all. She might have a point as I've never had a client respond with distaste to my decks or their energy (at least those clients who want a reading - this isn't about those people who respond with distaste to my profession, that happens) even after they've been in the hands of clients all day at a fair. 

Varying Opinions
I have no issue with letting a client touch my cards. I've even had clients ask if they can go through my cards ot look at the images on a certain deck they are drawn to and let them. I don't feel it has a damaging effect and I usually cleanse my cards, thank them, and give them care between events anyways so I don't feel I'm bringing a jangle of energy home or from event to event to event. 

What About a Client with Bad Energy?
You can always choose who you want to read the cards for. I talk about this in my blog post on reading for people you don't resonate with. 
That being said, if you still would like to go on with reading for someone who's energy you don't feel comfortable with, by all means, shuffle, cut, and deal the cards yourself. Most clients won't know the difference. If they do ask why they aren't cutting the deck themselves, just say that you felt moved to do so or were intuitively guided. You don't have to make them feel uncomfortable by stating you don't like their energy. 

Cleansing Your Deck
If someone does touch your deck and you don't like it or feel the need to cleanse your cards, there are many ways you can do so - I discuss them here. 
If you are at an event or party, the easiest way is to shuffle the cards continuously with the intention of dispersing the energies on them. Otherwise, you can be as elaborate or as simple in the cleansing process as you like. This is also why I usually if not always have a cleansing stone like clear quartz or selenite near at hand for space clearing. 

However, I also know clients who guard their tools and tarot with great vindication. No one touches these cards but them and if they do, those cards then undergo a thorough cleansing and cycle of re-bonding with the reader. 
Still other clients have 2 decks - 1 they read for clients and allow or don't mind when they are touched and 1 for themselves that no one touches but them to keep the bond strong. 

As for how much each tarot reader allows others to touch the cards is also varying. Some only allow a client to cut the deck but do not allow any further handling. Others don't mind or even desire the client to thoroughly handle the cards. 
I used to ask my clients to shuffle the cards - I stopped doing that when 2/3rds of my clients turned out to be uncomfortable with it as they felt they weren't good at shuffling or had a hard time with 78 cards that were a lil bigger than a standard 52 card playing deck. I still have my clients, when in person, cut the deck because I think it draws them further into the experience and the connection between them, their question, the cards, and me can only benefit from it in my mind. 
Like I said before, when it comes to this question, it all depends on the reader and their personal beliefs.