Because Stefan either hasn't considered it, or he doesn't feel like it. Either way I posted it on the official forums that he visits, so he will likely see it.

Someone post this idea on official forums, if they can... then stefan and unixmad can see and may think about it.

oh just saw post mybad xD

Well that's great. AND NOW WE WAIT. You could link this thread to the official forums, since we have stated plenty of good reasons to do it.

but guys, think, when has stefan and unixmad ever REALLY listened to players like us? no matter how great the idea is it gets shoved away. Much like the trading system idea, many players want a trading system but stefan ignores it. id think graal on steam would be a WONDERFUL idea. But the odds of it actually happening are quite slim.