Completely disagree with what you're saying. The reviewers do read each and every article thoroughly. As I've said in the beginning of my post, this isn't aimed at the reviewers.
I feel that the main problem could be the lack of a standardized procedure regarding upvotes and possible deduction of upvote value.
Well, maybe it's true that 'some' reviewers might read each and every article thoroughly. But clearly the ones in charge to grant the upvotes doesn't!!