What about $7.99/mo to apply for and keep a blue check? It’s only displayed if you’re verified _and_ a subscriber.
If your ad spend is greater than ~$5k, you get a twitter liaison that can fast-track verification.
I guess not many people do as I do. But promoting one’s stupid tweets is a pretty good indication of someone I do not and will never have any interest in hearing from… I suppose I might make an exception for a sufficiently funny/edgy promoted tweet, but I also suspect that twitter enforces stricter content rules on promoted tweets?