Umm.....
What you're missing is that the "Warrior" image is part of the game for the 'occasional' player. It's a fantasy, in the same way that batting cages are a fantasy to playing baseball. (I don't know if there's an equivelent in the UK, sorry...)
It's part of the draw. You get people to come out, they dress in camos, and they play out in the woods and shoot their friends up. It's a harmless fantasy. To tell tehse guys they need to wear bright, colorful uniforms would turn a lot of them off. Not just because they can't use it to hide in the woods. But also becasue it doesn't fall into the fantasy.
You forget that MOST rental sites are still in the woods. Oh sure, they've got an airball field or two, but it's still in the WOODS. And partof woods ball is CAMO. There's also the point that teams change from game to game in the rental world, so you'd make these gus stock twice the jerseys so that a guy could change teams mid-day? Not likely.
And, until paintball is a "real" sport, you can't convince the renter crowd that bright jerseys are the way to go. Besides, why should a field owner make them buy into the sport fantasy when they're happy with the one they've got?
-Tyger