Well a decent Sapphire will cost you £8k+ so for 3drs to go up isn't a shocker - a 500 in similar condition to the one in question would cost you up to £30k so it's not that shocking if you start seeing 3drs (mint ones) rise to around £15-16k.

As for Pete he knows he got a bargain, we've already spoke about this over on the rsoc bb.