One of the things that I hate as a reason for why people do certain magic tricks is that “it’s a classic for a reason” or “just because you know it doesn’t mean the audience has seen it before“. To me these are lame reasons to justify doing a magic trick.
I’m performing at a fair right now and the vendor at the back of the audience where I’m working has a magic coloring book that he’s using to entertain the kids of the people he’s trying to sell insurance to. He’s a nice guy and he’s using it for a solid reason. However if that was a trick I did in my show, no matter how great my routine was, if someone had been to his booth, my routine wouldn’t play as well.
This is one of the reasons why I try to do more unique tricks, so I don’t have to deal with situations like there…or being in variety shows because someone is doing something similar and that forces me to cut duplicate material.