Looks very promising project with not stricted payment option. But you think twice, because mobile devices are the future. Many and many people started to stop purchasing of these stationaries and laptops. In other words, they slowly dissapearing from a market share too.
Or/and there another way to play a some of games via cross-platform systems, like Jagex done on Runescape. Html5 idea looks very good for a different OS/platforms.
I hope you will not forget these mobile peoples, who don't want to buy an heavy weight laptop or light one tablet with a x86 of cpu architecture +windows os to play wurm (on example), because android devices are unfriendly to this game.
Well good luck with a this project and don't thrown it away