If you are selling a high end product such as Levinson I am sure you would have a clue what it is worth.Don't be so sure. There is a pair of Vandy 5s (not 5As) that's been advertised by the same person on this site for several years. $6250; factory boxes and HP-5 crossovers extra!
I'm guessing these kind of pricing is based on the "bigger fool" theory of real-estate...no matter how much you paid, there's a bigger fool out there somewhere who is willing to pay more ;-) 'course you see how that model panned out in the great recession.
Just my $0.02. YMMV.