Merit sources aren't allowed to sell merit as previously stated. If they do, I think they'd probably get removed as a merit source and a 7 day temp ban. If a mod breaks the rules of that I assume they'll be demodded if they do it multiple times as they can't really ban an active mod.

If anyone else sells merit, I assume a member like Vod or Lauda (or anyone else on DT) will happily red them if they find all accounts involved as negging a throwaway doesn't really do much.