Well, if you want to get technical, (And please correct me if I'm wrong here) when you buy a game, you don't OWN the software, you pay for the right to RUN said software; the software is still owned by the company that produced it. You know those End User License Agreements people always skip? Those EULA's outline all the rights you just paid for, and those rights don't typically extend to the duplication of the software, to be distributed however you wish. And this isn't just for games nowadays, I think it's always been that way. The physical mediums are simply a means to get the software to you, so the company holds up their end of the deal; You buy the license, they provide you a means to run the software. Now don't get me wrong. I've leaned toward the illegitimate side of software ownership in the past. However I now understand the implications of my actions; By downloading and running a COPY of something, I never payed for the right to do so. Using that logic, I don't do it anymore. Developers need to eat, too.
Now do you understand? Be honest.