Paintball is a professional sport. Teams of highly skilled members get together for tournaments all across the nation, and i believe the tournaments you attend are determined by the region you live in. The guys who are into that much have fully auto guns worth well over $1000. I've gone and watched some of the tournaments before. And I can tell you it's not a kids thing at that level. Far from it.

P.S. For those of you who doubt a paintball gun costs that much check this out. Angels are one of the best money can buy from what I hear, but there are others that cost even more.
http://www.actionvillage.com/is-bin/INTERSHOP.enfinity/eCS/Store/en/-/USD/DisplayProductInformation-Start?ProductSKU=010-151-0059