You're missing the point: Twitter doesn't sell you anything, you're the product. They sell ads.

Twitter sells you a voice to a possibly broad audience depending on how many followers you have, the ads are a micro-currency to facilitate these transactions between voice haver and voice hearer.

That's been utterly ruined by the blue check mark verification system.

Promoting a specific type of user over another is antithetical to the original ideals of Internet forums - whereby the most interesting / useful / "good" content filtered to the top regardless of authorship.