I tend to agree with Paddy, putting stuff in your mouth/taking it out isn't a great idea in a restaurant. But there are other effects that can be done with a bite-out, look into coin in bottle, etc.
That would be the other reason I don't use this. I heard paddy mention this a long time ago in the restaurant forum and I realized that people could have a really adverse reaction to this if it's done in the wrong setting.
Maybe "Torn and Restored Coin" from AoA would be a good route for people looking for a Bite Out Coin routine.