Atm following the asknostr hashtag is a bit like this lol, there are people self-promoting and some of it feels a bit like spam. So it wouldn't be too dissimilar lol, but at least the recipients would get paid to see the self-promotion.

(This is also part of a wider problem of discovery, something which eg the primal trending sidebar totally fails at when it shows you their top 20 read-receipted posts. But that's another story lol)