Parts Prices, WTF?!

I Cant remember which site i was on but there was a mopar hood tach for sale 750.00 and the seller didn't even know if it worked maybe it was a fair price but to me i thought it was rather amusing .
since obviously without question no one's going to give him that kind of money for a questionable tack he's asking for a reasonable offer???
Again what's reasonable to him starting at that point is not even worth my time trying to tell him what I think is reasonable... I would love to have it and I would put it on my car... But I think we are several light years apart under the umbrella of reasonable...