If you see somebody selling merit: make a post in the reputation section and/or report the seller. Both seller and buyer will probably receive -ve from DT and get their accounts ruined (including whatever they invested in buying merit).

Selling merit is prohibited, however this doesn't mean it isn't going to happen, there are a limited number of mods and and admins... They can't monitor each and every thread, let alone monitor off-forum sales.  That's why it's important we report these cheaters