You have to take into account that on those private servers, no one pays to play on them. It's all free. You think that many players will pay a montly fee to play an 8 year old version of a game that won't get any updates and well to be honest, looks shit compared to now. And also, you got to understand, it's not exactly like normal rs. I mean, they got stores that sell all kinds of stuff. Like it was in the EOC beta worlds. Free food, potions, armour and weapons.