Holy stuff.
On average, how much money do you have to pay monthy :O?
Depends on the spec of the server and the quality of the datacenter and network. For example, if you used the provider Kalphiter uses, you get a low quality datacenter on second rate hardware, hooked up to a slow, poorly connected network and you'd pay like $99 a month for that. The same hardware in a good quality datacenter would set you back something like $300 a month.