I find it hard to believe that jerseys and pants look the way they do because that is the market. There are no alternative options to contrast with them so we have no idea if other designs would be more popular.
Pump Scout, I started jumping in the conversation because it was there and I had to say something because I so hate the standard speedball look, but I am with you. Paintball specific pants and jerseys are crazy. Just use BDUs or sweatpants or jeans for that matter. The "Know Your Enemy" comic strip comes to mind.