"Block the tombs movement" for more overall raiding
When a raider gets fewer resources, it must raid more bases. So blocking all tombs will increase the amount of raiding. I already blocked all of my tombs just for that reason.
Tough choice, but we must do sacrifices for the common good.
Btw, I do not understand the fuss about tombs. I already got 10+ more maps and 25k orange, 30k blue, and 70k red. Everything is already bought out and all boosts are at max level.