$5.00 is my standard. Some sports who earn well north of $200,000 a year are so tight that when they pull a quarter out of their pockets the feathers molted off the eagle. Or god for bid they take a single out of their pockets George Washington is rubbing his eyes cause he hadn't seen the day of light since it went into their pockets.

Sometimes F/O's and F/A's need OJT their first trip out. I don't expect $5.00, but at least a buck.