Wow, I've never been dazzled with a receipt, just a tip jar. I do tip 2 dollars per trip (after I've enjoyed the lounge and services provided), but if by day 2 the attendant is progressive and anticipates my needs and make me feel her service is personal, then I usually tip 5 dollars. I appreciate tip culture as I was once a server in my teenage days, but it should be optional, not mandatory.