[Suggestions for SE] to prevent RMT

[ispano]

This won't prevent RMT, nothing will. Look at Diablo III, you could legally buy gold from the RMAH, and as dead as that game is right now there are still tons of RMT around.

You'll never completely be rid of RMT, but if you can effectively cripple them in your game, they don't become much of a nuisance.