Its a good idea and im sure nearly every player would want it, BUT it just wont work. Lets say you buy a bar, then you become unhappy about your purchase. You refund it and get half the money back. 100 000 gralats refunded = less money bought trough itunes money = alot less income for stefan. Since hosting a server costs money, dependant on what kind of server it can warry how much it cost. In this case you will be needing good hardware and alot of bandwidth = 2 expensive things. Also server hosting room and such. And graal era is not the only server that is being hosted, servers like:
Zone, Classic,
The pc servers: Zodiac, Delteria, Kingdom, Classic, Zone, Era. Plus all the player managed servers.
The other eurocenter games.