That's a great thing for him to do!
A couple of weeks ago, we had a birthday party of about 10 people. They were having a LARGE time stayed from 7:00 to closing.
The Birthday "girl" came up in the middle of a song and before I could stop her, grabbed my jar and started going around to the tables with it. Not cool, but dang, she was having so much fun than most everybody dug in and contributed. By the end of the night there was more than four h in it. I played the entire four hours with only one break, then another 30 minutes extra. You don't mind working hard if people are appreciating it!