I would definitely be a fan of password shows,but can see where it would have its downside as well.
For example, when you don't meet your goal for the shift, what do you usually do? Say something along the lines of "thanks to those of you who tipped, sorry we didn't hit the goal, see you tomorrow." That would be an excellent opportunity to do something for those tippers, probably not whatever the goal was,but still something.
On the other side, I could see that reducing the amount some people would tip, like "even if she doesn't meet her goal, I'll still get a show out of it, so why tip so much?" kinda thing.
For example, when you don't meet your goal for the shift, what do you usually do? Say something along the lines of "thanks to those of you who tipped, sorry we didn't hit the goal, see you tomorrow." That would be an excellent opportunity to do something for those tippers, probably not whatever the goal was,but still something.
On the other side, I could see that reducing the amount some people would tip, like "even if she doesn't meet her goal, I'll still get a show out of it, so why tip so much?" kinda thing.