They do, but the fact remains that you can’t effectively incentivize people to work more for you personally when they’re already soul-crushingly overworked doing things for everyone else in their rotation. Trying to get more out of nurses who are in the industry already would be trying to squeeze blood from a stone. Also, you don’t go to college for several years to be a server. If people realize they’re going to have to beg for tips from their patients, then that won’t bode well for the profession.