I just evented the manual levelling up system. Players can now level themselves up through finishing quests, mining and other various activities.
I expect we won't get anybody above level 20, but please prove me wrong. To evident me with that point, here's a graph:

So yeh. Nearly 150000 XP to reach level 50. Keep in mind, mining one ore gives you 15 XP. You guys are sure in for a treat ;D