While that is true is some cases, it's not true in all. Some pirate because they can't get it otherwise (ex. region exclusions, see Game of Thrones), some because they want to try out a game but there is no trial, and some because they don't want to deal will all the stupid ads and Don't pirate crap on DVD's now (SEE: http://bit.ly/eriKlB) as well as broken DRM management (Sony Music CD's anyone)
Companies try to hurt pirates with DRM but all they hurt are the paying customers, who do not have it easier. The recent fiasco with SimCity is a perfect example of that. Paying customers got screwed because of EA's DRM scheme.
And the long term effect of Steams DRM has yet to be proven. If Steam goes under and we lose all the games we paid for does that still qualify as reasonable or completely borked?
I get that companies want to protect their assets, but applying 19th processes to a 21st century reality is never, ever going to work.