What you're describing is pay-to-play. And that's a perfectly fine way to bring in revenue. That can exist alongside with advertising revenue as a source of income.

You have stated your personal distaste for ads but the vast majority of Internet users do not share it. Social media is still a growing business and it's funded to an overwhelming degree by advertisers. All the Internet giants, including Google, get the vast majority of their revenue from ads. Gargantuan value is supported by ad revenue. It is nothing to scoff at. (And, no, it doesn't have to be 1990's style blinking banner ads on a white background. And there is much more to paid promotion than banner ads.)