It's not that crazy, IMO. Domaining is so speculative. If I see a name for sale here at the forum, I might not bid even if I like it. I might ask, "why am I the only one with interest?" or the like. When that domain goes to a big name auction, the proof that I was right to like it comes when others bid.
That said, for me that would explain paying $100 elsewhere for something I didn't pay $75 for here...no way its $20/$200 or anything.
I think many sellers lower the prices WAY too much here at NPs, thinking that a lack of initial interest means the name isn't worthy of the original asking price. There are true bargains to be had here at NP, for just the reason the OP is talking about.