"Are you suggesting that curation rewards shouldn't depend on the the size of the voting stake used?"

Absolutely! Just imagine if our political voting systems were based on how much money voters had! That would mean that less than 1% of the world would be able to dictate how the remaining 99% plus lived, and that 99% plus would have absolutely no say in the matter. No thanks!

"How much do they get paid on Facebook for liking posts again?"

Facebook members do not have to pay in order to be allowed to like posts. Besides, the vast majority of Steemit members can make just as much money on Facebook....yes, nothing!

Steemit is a quickly dying platform for this, and many other reasons.