Paying to Develop?

[ChibiChibiLuc]

Can anyone explain to me the thinking behind the whole 'You have to pay us to develop our game' crap?

I've been thinking about and it really confuses me.
Why do developers have to pay Graal Online for the 'privelege' of working on servers?
We're creating new content, which in turn attracts new players and encourages old players to continue subscribing to Graal.

We're making Graal Online more money, so why are they charging us to do so?
I really don't see a point to it.
Graal, in my opinion, loses it's fun after the first month. I only 'play' Graal for the scripting aspects, and I can't even continue to do that to my fullest extent unless I give them more of my money.

Thoughts on this/reasons for making us pay to develop?