With regard to offering returns it makes sense when selling brand new items where the shipping is low. However, it’s not feasible when selling pre-owned items such as antiques or vintage collectibles. Especially when they are large and heavy. I don’t consider it bad business to state that you don't accept returns in these categories.
However, when selling in these categories it’s even more important to accurately describe your item and point out any flaws in the description with pictures. If it’s a mechanical or electronic item you need to make sure that it functions properly and if batteries are used that they are fully charged if included. If someone is actually unhappy over something I missed of course I would accept a return.
I really dislike listings where people list an item as used, but they haven’t checked to make sure it actually functions. For example, selling a cassette player and then state that it’s untested. But then state that they don't take returns.
Then they are surprised that their buyer requests a return because it doesn't work.
