Purchased an account from this guy which went smoothly, in fact didnt like the account i purchased so i upgrade with a little extra payment. Everything went smoothly, i took a week off from playing on the server i got an account from him and it was banned on my return for RMT. Its a risk so i mentioned to Quaked on discord about the issue and he pretty much ghosted me. Not even a sorry about that, no reason for it to be flagged unless something dodgy was on the account before i purchased it.
He also has paypal sent as a payment to friends and family so if this does happen you can claim it back. Quite smart, use at your own risk.