Great story, mousepod!
My mom was a major TJ fan so I got a pretty good dose of his music as a kid. My parents also saw in him in Vegas a few times and always raved about how great a show he did.
Concerning the sweat, I con only imagine how many bright lights accompany a TJ show. It's probably 150 degrees on that stage. I know from my past experience of having to play drums under a lot of bright lights (and nowhere near as many as Tom, I'm sure) it really gets the sweat flowing. Nothing like trying to hold on to two varnished drumsticks when you are drenched.
Then again, I do recall noticing that Robin Williams seems to sweat enormously. Maybe Tom is special that way.
Regardless, congrats to Mr Jones.