Likely the scammer doesn't care what the Audiogon cost is because he's using a stolen credit card number to fund his scam ad.
Scams on Audiogon (McIntosh Amps)
I recently purchased a MC-452 on Audiogon for an amount close to market price... but I have seen this specific ad (link below) pop up now and then, only to disappear agian. Going by the incredibly low price its offered at, I'm guessing this is a scam.
My question is how do these ads make it past the approval stage? I woudl have easily fallen for this since I was looking for this specific amp!