Let me just say I can't stand seeing talc all over the place. I walk into a pool room and it looks like sombody was changing a baby on the tables! I have seen so many "players" go to the talc and prepare as if they are about to do a gymnastics routine! I always wonder what the thinking is there. I mean the concept is to dry your hands and reduce the friction between your hand and the cue, so why would you put in on youy GRIP hand that has a nice wrap to give some grip surface! Most of these people are not using the talc for its function, they just saw it in a movie or saw sombody else do it, so they do it too. They see the talc there feel some sort of social pressure to use it too.
On the rare ocassion that I feel that my hands or cue is feeling a bit "tacky", I find that washing and drying my hands and wiping the cue shaft solves the problem completely.
One more thing I would like to suggest. You should obviously offer gloves for sale, but there is a better product in my opinion. I forget the exact name of it, but I think it was called pro glide. Steve Mizerak used to endorse it. Anyway, it is a really good and inexpensive solution that should make everyone happy. It is a liquid that dries clear in a matter of seconds, and works better than talc. It makes NO mess, and lasts longer than talc.
You should have this for sale, and also have one behind the counter to let people have a trial use of it.
I used to work in pool rooms. I was very careful about the powder use. I kept one container of it behind the counter. If a "player" asked for it, I would give them a small amount and give them a quick tutorial on its use, and why it was not to be used in any manner as to get on the table and the balls, etc. I never let one of them take it to the table.
I think you are on the right track, but make sure your customers have a reasonable option ( gloves, pro glide, etc) to make their playing experience enjoyable.
Jw