Have you ever performed solo, or in a small group, in front of thousands of people? I've done both. The rush is outrageous, and about as strong, either way. The main difference is the result if you crash.
As a matter of fact, I have! I've done a fair amount of public speaking in my day (all 19 years of it). The biggest group I've spoken in front of was all the kids and parents at my Freshman orientation for college. The speaker they had planned was late arriving so the emcee was like, "Anyone have anything funny they can do on stage?" I had just written a speech entitled "How to Win A Conversation" which I proceeded to deliver in front of some 800 people. It went over very well, got all the laughs I thought it should, and it was quite a rush.
But it wasn't skydiving.
There's something to be said for falling through the sky at over 100mph for over a minute at a time. And then, when the chute is open, the feeling of absolute freedom as you look around you, surrounded by nothing, is just incredible. It's almost undescribable. It truly is an experience. I have to say, though, it is a little disconcerting at first looking down (this is after the chute is open) and you see your feet dangling there. And then you look farther down and you see the ground. And there's nothing between your shoes and the ground but some air. But man is it ever cool.
Harvey is right about the rush, though. Doing anything that really gets your adrenelin pumping is going to give you a rush. But what performing for a large audience lacks is the physical aspect of the rush. In my opinion, the danger involved adds to the thrill. I'm a big fan of walking to the edge, looking down, and walking back. I like to think you have to come close to losing it all to see what is you really have. And no better way of doing that than falling out of a plane. Just do everything you can to make sure you can walk back from the edge.
I say again: I suggest you go.
EDIT: Typo