The new way for renting playerworld servers is up - see the subscription page at
http://www.graalonline.com/playerworlds/stores/upgrade
This will replace the graal.net system, all existing servers will be switched to the new system in a few weeks.
This is how it works:
You buy a Developer Gold subscription, login to the game with the game client, and you will see the server on the list. For you its on the normal serverlist, other people need to type the name in the server name box. You will gain full rights on your server, and your ip-range will automatically be set to allow your ip and computer. The other things are the same like for graal.net managed servers.
Payment methods:
You can use the same payment methods like for account subscriptions, so it is possible to rent a server with PayByCash now
About the Developer guilds (Developer Pack):
Those will be added in a few weeks, they are planned to be around the same price, a developer guild will require 3 members with developer packs, and it will use the same system like the personal servers. The normal Developer Pack will cost around $19 for a half year and $34 for a full year (so if you multiply with 3 it is like the same price for a server).