Before HF21 there was really doubtful reason to Power Up, given that one could milk author rewards (that are supposed to be in hands of SP holders) without having any of funds locked in, just by using paid voting services.
By the way, running nodes when it comes to hardware doesn't cost that much. It's experienced, skilled, trustworthy human beings that are of value.
Actually I was OK with 2 year vesting and no delegations possible :-)