Mecum auctions notwithstanding. The guy that dumps 25-60k into a classic likely won't see a 1/3 of that and the schmuck that rolls his new gt or ss off the showroom floor will lose his ass the moment the for sale sign goes in the window.You cannot call the typical insanity that takes place during the typical collector car auction "selling a used car".
Only vehicles I've seen purchased new that offer a minimal loss are jeep wranglers and even then you're going to take a hit when you sell, although buying and flipping used ones can be pretty lucrative.