There is no effective way of stopping only those that sell such cards. This is where the problem lies. Either we ban all gift card sales or we continue with the endless fight (from the staffs perspective).
You should join the "HateLeague" , which at the moment has 3 DT members , me , Lutpin and sho along with james and whywefight[QS is supposed to be in it too, but haven't recieved any confirmation from him, but pretty sure he's in with the "Tag the money launderers"as well]. I for one would be willing to tag them
I guess a coordinated effort from DT members should have an effect. However, the name is awful.