If you buy donuts, do not waste them on speeding up tasks... Buy Premium Items that give you higher money/XP multipliers... someone elde mentioned this, but I am Reinforcing this notion...
Speaking on the Topic of house farming, I am a reformed house farmer, If you can bare the stigma that accompanies it, farm away, as money is important to for upgrading as well... however... there is a formula for effective house farming - land to farm to actual buildings ratio... its easy to take it too far...
Im sorry if I am rehashing old info from the other posts... I'm at the Dr.s office and board :wink: