I propose that, similar to survival, you only get pixels when you are moving around and building, not when AFK. This would prevent people from pixel farming
Then again there's no real purpose to pixels yet, other then the /baltop which isn't even implemented for some ranks.
Well pixels are getting a purpose sometime soon, and if they don't, then they would most likely be removed. I was also pretty sure that you can't run Minecraft for over 48 hours, but farming is okay for now I suppose.