Some who get tips have to "turn it in" to a pool of some sort. My reasoning comes from what an unsavory employer did to their employees, one of which, for a short time, was one of my kids. If they were caught not turning in a cash tip, they were fired. Card tips were easier to track at the end of shift, and can be monitored by higher up than the shift manager,, and were tougher for the shift manager to pocket (which was being done with cash). So for me, if it never leaves the server's hands (unless they choose to tip out), I am good with cash. Otherwise, card it is.