You and JB may well be right. I am not a fan of the gold body moldings but if I wanted that car, it would be pretty simple to have them repainted in the color I would like (silver). The seats are a different issue. I wasn't repulsed by them and again, if I wanted that char, that would be a minor issue. In spite of the many positive comments about the seats and interior, the serious buyers may have been turned off. I have cloth seats and I can tell you that even on a hot day in North Carolina, my un-airconditioned car is not that uncomfortable (I'm glad I don't live in Phoenix or the Nevada or Utah deserts!). A black vinyl interior, while durable, can be seriously uncomfortable in the summer in some places so I would think a nicely done cloth interior would be a plus.
You make a good point about the VIN tags, Richard. I didn't quite understand all of that story.
Deleting the boosters, adding headers, taking off the crossover tubes, etc. do not constitute a real change from stock to me. Since I'm not one who values originality over competently done worthwhile mods, I can't say that the mods on the seller's car didn't dissuade those originalists from bidding but they might have.
One guy commented that not having a 5-speed was a problem. Could be. It was not fully sorted. Maybe that was a problem. And maybe it was a combination of a bunch of "small" things that buyers didn't want to have to fool with. In any case, I think someone missed out on a very nice car.