I'll go $450 on this. <.<
This guy is a known scammer. Stole $550 from a newbie. Stay away, just check his trust rating and the references.
That shouldn't stop an escrow transaction. Everyone is safe that way.
Escrow solves all problems.
No, it definitely should irk someone that you are offering *above* the asking price for the miner + you're actually, undoubtably, a scammer.
I advise absolutely nobody to to business with this person. Seriously, you literally stole $550 FOUR days ago. Hell, it shouldn't even matter how long its been.
What would OP do if you tried to dispute the transaction, claiming it never shipped in order to get a refund? The only situation where the OP should ever trade with you is if you send first...
And I sure wouldn't advise you doing that.