I hate to ask, if 'is this the same tach that can be bought at the part store for $40" isn't a relevant question (admissable by the rule pointed out) then what is?
If it is the ultra rare version that was made of unobtanium it gives the seller a chance to state that fact and it also bumps the for sale ad back to the top of the list. The more people are talking about an item and the more it gets in front of buyers, the more of a chance it has to sell at it's asking price.