This is one of those ideas that appeals to economists and nerds, but rarely works out irl.

Artificially or intentionally aligning interests tends to be a "genie, make me a sandwich^" problem. There are lots of places where "reversing the charges," seems good in theory... but it never happens.

Anyway, linkedin have something like this. In practice, it feels like a better quality of spam, rather than a solution to spam.

^Poof. you are now a sandwich.