I am pro-cash but the filtering effect of requiring people to pay a small amount of money to be in whatever establishment is a HUGE positive for the user experience. I live in the SF Bay Area; I do not want to hang out anywhere that allows homeless people inside, period. Is that callous? I dunno. I don't hate them or wish them ill, I simply don't want to be around them for obvious reasons not least being safety concerns (I am a 5'4" woman).