It's a nifty idea, but for Graal.... nah. Simply because there is already farming on Graal. There's farming on GK and Bomy Moon, and I'm sure there is farming elsewhere on other playerworlds.
It just hasn't been emphasized to the point where it's like a whole experience in it's own. I'm heavily influenced by games like harvest moon. (heck, I want to work for natsume)
I'm making sure that Oasis will rival and hopefully better, the harvest moon farming system.
To base a whole server around it would be pretty difficult. It could be done, and I'd probably play it a lot if it was done well. But if it's not up to at least Harvest Moon standards, then it will fail.