Agreed. Selling your PGP key is never ok... It is supposed to prove your identity. Selling your account as an escrow provider is shady enough, selling your PGP key along with it is downright perpetrating fraud.
I can't believe I even need to state this, but I will never sell my PGP key, forum username, or my public Bitcoin address key. I will also never act as an (assumed 3rd party) escrow for trades involving myself. If I ever do any of these things, you can consider this contractual documentation that I will not press charges against anyone who finds me and punches me in the face.
I guess only his passport and house were left to sell to this scammer or may be he has sold that as well. I remember my thread I had created in March about account sales as people were selling their PayPal accounts too. That time shorena and few other users dint agree with me and said it's fine. Now with escrows selling their private keys, email accounts and possibly everything he owns on this forum, I wonder if anyone would recommend using an escrow.
I don't buy the excuse of master-p selling almost everything he owned as an escrow for just 1-2 BTC. It seems to be himself who wanted to scam users of this forum which is itself has caused harm to the reputation of escrows here. Only theymos or Badbear can track the IP and state whether or not the account was sold and check the IP location unless he has used a proxy.
PS: I am also a victim of this. I have 3 BTC stuck with master-P.
I'm really sorry for your loss. Trusting an escrow and getting scammed is the worst of all and 3 BTC is really a huge sum of money. I just hope he gets back and pays everyone if he cares for the account.