IMO not even remotely realistic...or consistent.Is this reasonably priced for the original MB800 amp? They also have a used MB 800 Fusion for $599 which seems more realistic. Apparently both of these 800W models are quite hard to track down, or get historical sale data on.
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In June of 2022, I bought a used MB800 from Guitar Center for $399.
Granted, I got an absolute bargain for that amp - typical used prices for an MB800 are more around $500 - but I'm guessing that a sales associate with limited product knowledge didn't know the difference between the MB800 and the newer GK heads.
Heck, they have used Legacy 800s on their site for less than that MB800.