I've never seen it this way, because I've always sold my stuff face to face.Easy, the Studio will suffer the most.
A few years from now, when your two otherwise comparable machines go up on eBay, people won't pay as much for the Studio because the larger and much heavier Studio is going to cost more to ship. 😁 The "price-including-shipping to performance ratio" will heavily favor the M2 Pro Mini over the M1 Studio.
Maybe I should consider eBay a little more. It could make it easier to sell Apple products. I'm always scared of just getting stabbed during the transaction 😅 I've read so many things in the newspaper.