If you can't buy the software NEW then the copyright owner can never receive payment. The only time they copyright owner gets paid is when they do a wholesale sell to the retailer. Or if they sell it to you directly.
If the copyright owner can never receive payment, they can't ever have "lost money" for their hard work.
Its why software distributers don't like second hand traders like EB. Copyright owners would love it if software was tied to a single machine forever, and not by licence agreements but by some physical means (even better if it was tied to the same person on the same machine). That way no second hand sales would be possible.
Maybe its morally wrong.
Reality is I'd wager 90% of people on this forum and anyone who owns a computer has at least ONE piece of software the copyright hasn't been paid for. And probably a lot more.