What happens when the DRM server closes after a bunch of year ? You'll have to download a crack. It will be okay then, but in the end you'll be downloading the exact same thing as the pirate and will probably be sharing it with those evil pirates as you download it.
Thanks to annoying DRM plaguing most CDs I use to buy (not playing on my Hi-Fi, not playing properly on my PC,...), I had to download (and therefore share) the albums I just bought so I could have a proper copy. After a while, you wonder why you have to get to the store to buy an album, when the music that will actually play comes from pirated mp3s and not the CDs.
The thing is some people cares about having products that work properly. If the legit version works fine, then there's no reason to look anywhere else. But if it's crippled, then the proper (pirate) version may look quite attractive. Too me, abusive DRMs do "promote" piracy in a way.