The reason that Altair processor card got that amount
was not because of
the card itself but because of the 8080 processor on it. Apparently, a
few chip collectors creamed their pants over it because it was an Intel
C8080, harboring some manner of significance to them.
The buyer was "prepared to go well over $1000 for that chip". That chip
is apparently listed as having a value of $1,800 on one collector's site.
Are you in communication with the buyer? Do you think he would be willing
to pull the chip and sell the card? I'll happily drop an 8080a in it and
use it. It's really rather sad, kind of like buying a car for the spark
plugs. Actually, maybe stupid is a better word than sad.