Guess I might as well respond to this seeing as how Xsyon booted me while I was in the middle of a fight with a bear

But yea, I agree with this idea 100%

UO used to have a house decay, didn't require paying money, just that you or someone else on house friend list open the door every 7 days or the house would start to decay till it was gone after 2 weeks I think.

I think a resource cost in this game make more sense cause it's sorta representative that the tribe is 'reparing and upgrading' the buildings. Very apropriate and fitting. Plus it does attempt to promote an economy. And if the resource cost was high enough then the local resources would drain gradually and either force tribes to move, as many civilizations have had to in past, or create trade and or colonies that supply resources to the primary tribe.