I quit paintball for allot of reasons.
Paint is expensive, messy, fragile, and must be used rather quickly to avoid deforming.
A broken paintball in your barrel is a huge pain in the ass decreases the already low accuracy of the paintballs.
Having to find a place to get our c02 or nitro filled. We played on a private field so we could decide how the game was run which means their was no access to more air if someone ran out. ( getting your tanks tested every few years sucks too)
Our group was into a more realistic game style anyway so when the rest of our guys turned 18 our core group switched to airsoft within the year and we haven't looked back.