In my opinion, you look at the total purchase price including shipping. The guy could have started the bid at $600 and free shipping. Shipping is just part of the cost of aquisition.
The bow is worth what someone will pay for it, including high shipping, no more, no less.
You don't see Jets come up that often. If someone is wanting one bad enough, a total price of $800 is not unreasonable for that bow.
I have a 57# that I can't handle any more; so there is no point in me buying a 58#.
I am shooting a 54# Jet right now that eats my lunch after 20 targets on a 3D course. Hunting is a different issue. I consider myself luckey if I get one shot in a season. I can handle that.
Bottem like is, the man has set his price, including shipping. If you want it, step up to it. If not, don't bid.
If someone gets that bow for $750 I would say he got a fair deal. Anything over that is a decent deal because at least two bidders pushed it up that high.
It is a 1975 model. It has already gone through it's depreciation and now is on the upswing as a collectible.
I can tell you that the oldest Jet is no different than one of the last ones that Jack made. He made no changes in the model.
If it is solid and in decent shape, it is worth the money. As far as I can see the bow is straight up and in unusually good condition for a 35 year old bow.