The difference with physical is that you own the physical medium the license is stored on and are permitted to sell the physical medium with the license. With digital downloads you are not allowed to sell a drive with the files. Since you are technically making a copy.
The difference with physical is that you own the physical medium the license is stored on and are permitted to sell the physical medium with the license. With digital downloads you are not allowed to sell a drive with the files. Since you are technically making a copy.
The worth of a gog game secondhand is 0 though. Theres nothing to be made there.
People do sell accounts though.