Most of the people doing cracks most likely have little interest in the actual game or playing it. It's the challenge and making 'the man,' look like an idiot by breaking supposed security quickly.
I personally believe in supporting game developers and artists and buy my software, pay 99 cents for a song download, and keep things legitimate, but I won't support Ubi's new DRM scheme.
It's tiring enough to bring game disks with me for single player, but being restricted by having to have an internet connection is just too much. What if I am on a plane? In a remote vacation spot? In a hotel that charges $15 for wireless access?
The entire point of paying for a game is to play it at my convenience and while I don't believe in piracy I do agree that this sort of DRM harms consumers like me and actually encourages more piracy, but Ubi has probably taken this into consideration and doesn't care.
Thankfully I thought Assassin's Creed, while smooth and nice looking was pretty boring and repetitive and never planned on getting AC2.