The idea that I would give my credit card digits (and CCV!) to a bartender for safe keeping is almost physically painful. I'm the one thinking they are the criminal (and not without justification given the rate of card fraud). I don't let restaurant servers walk away with my card now.
(And split bills should be automatic, they just don't do it because they get bigger tips that way.)
Where are the book stores that ask you to leave your bag? Except for teens maybe it seems weird.