Okay I don't "get it", regarding the popularity of FarmVille but I had an idea for a similar online game.
"CropVille" - A working title at this point (means I'm not committed to the name). Anyway, you grow pot. Yes, cannabis. marijuana. Location most likely, between the grapevines in northern California. You sell on the street than build enough finances to support and or own Medical Marijuana Stores / facilities? Whatcha think? Don't be afraid, have fun with the ideas, no one will think less of you.

Hey, at least it's not entirely illegal like Grand Theft Auto and such. And no, I wasn't "high" when I thought of this.
Who thinks this might be a fun game or at least maybe the next internet time consuming addiction?