[NinjaKnight]

Very true. There are very few servers that don't involve upgrades when people play. At least PVP servers don't. Mojang has been trying to do that, making sure that servers don't have paying IRL money for upgrades. But I don't think that will affect servers that run bukkit or spigget. Since those types of servers don't go through Mojang.

-NinjaKnight-