The tips are divided to make sure everyone gets the "basic" tip (the $10.00 per day/per person). Anything over the "basic" tip must
be reported (as kitty2 said, they can be fired for not turning in the extra cash), but if everyone has tipped the "basic" tip, the staff get to keep the extra tip amount.
We always leave the $10.00 per day/per person on our account, then tip extra to staff who go "above and beyond". We just find it easier