I'd say the seller probably knows he has a mid-performance level saw in the 40-49cc class, and he knows that many chain saw fans know exactly what an 023 is and will or will not do.
I'd say he is also misrepresenting his saw to the other folks who don't know what they're buying, and hoping that whoever bids it up during the last 10 minutes doesn't know any better anyway. Heck, the saw probably has a non-fumctioning oiler and weak compression, too.
I've bought a few things on e-bay that burned me, etc. Maybe I'm just cynical