Would be nice if you didn't have to sift through an entire ad just to find out whether or not it's paid, unpaid, or rev. share, via a selected tag the person must choose upon post creation that would display in the front of the post as:

[Paid] [Unpaid] [Rev. Share]

Unpaid and Rev Share could both be selected as options, but Paid and Rev. Share wouldn't as it could come off deceptive if people claim the payment itself is the revenue share.