You can get merit by making good and useful posts and gift it to other when you think they made a good post. Afraid of buying merit from other people. Selling sMerit prohibited and punishable, most often the painting your trust rank in RED. I think purchase also not approved, but how it will be punished isnt yet known. SMerit transfer from one of your account to another (it's multiaccounting) is also punishable. What be in the future for trying to get benefit from your sMerit -- UNKNOWN.

Your merit and sMerit counter  HERE