Go with me on this one.
As I understand it, the chief lure of paintball is to be able to have a socially acceptable gun battle with real live humans. To live out your storming-the-beach-at-Normandy/holding-down-the-Alamo/defending-precinct 13 fantasies without actually shooting anyone. (And for the truly sadistic, it's a corporate team building exercise.) But that's why it has survived as a recreational activity for so long.
Again, as I understand it, the chief lure of first-person-shooter videogames is to be able to storm the beach at Normandy/repel alien mutant invaders/lead an expert tactical assault team in a virtually immersive environment. While you aren't actually interacting in any way with reality, all the trappings are there, enough to get you over the theoretical hump.
I was flipping through a DC comic, I think it was Desolation Jones #7, and came across an ad for this:
It's a videogame of an activity that people do when they want to do the thing that videogames allow them to do.
Some days, man...I just lose faith.