PPV sure can be tricky BUT if somebody cheats on you once with PPV, then you wont upvote him again.
Lets say somebody makes a post 'FREE [whatever] wit hthis method'. If you like [whatever] and upvote and its really that - then you know you can trust the guy.
If not - skip it. Also i think only estavblished authors could have it.
There are blogs where you subscribe by paypal for "hidden" sections, this PPV would solve this in crypto scene.
I didnt come across any of those hidden section , yet. BUT Im really new. Paypal on steemit sounds really uncool, I have to admit.
I just feel like a few people "forgetting" to upvote is not as bad as having posts I have to upvote to read. Radical example would be a political discussion where somebody has an opinion that I absolutly not agree with and do not want to support. I stil want to know his arguments, so I can argue against him, but I dont want to pay him for that.