Well, even when I admit that it's a good advantage, that's exactly one of the problems companies would have with the format... I mean, come on, it's not out interest to defend but something we can at least understand or not? If people are buying and reselling all the time that's less money, and can't blame companies for trying to avoid that situation when some people exploit that system way too much.
I like having my library digital mostly because I like switching from game to game quickly and because I'm prone to move a lot (even between countries) so I'm very used to it, this is the POV of someone not emotionally attached to physical format anyway.