The big difference between the cost in the comparison they use is obviously the ammo. But we all know you don't need as many paintballs as you need airsoft BB's. If I hit you with a single paintball, chances are you will feel it most of the time. If I hit you with a single Airsoft BB, chances are pretty good you won't feel it, so I have to shoot a lot more of them at you. But that's OK, because they are cheaper.