I'm only selling Gold coins, SC$ is different, that is the in-game currency. You can use the Gold coins to purchase SC$ though.
I earned my GC from leveling and leftovers from buying membership. The GM has nothing to do with the transaction. I create a virtual asset key that you can claim to redeem the Gold coins (GC). The problem wouldn't be if they were counterfeit/ not able to use them, because they can't be counterfeited nor is it limited to anyone, the only thing would be if you trust me or not.
If I don't send, you could do a chargeback on Paypal and post proof. I don't know what to say, it's a sale on the internet.