DRM only affects paying customers who play by the rules.
DRM ceased being about preventing "piracy" nearly a decade ago (if not earlier). DRM does not affect pirates. At best it makes difficult work for the one or two guys who initially crack a given scheme. Though I suspect those guys are probably getting more enjoyment out of unraveling the DRM than they would playing the game it's wrapped around - so even there it is a failure to affect "pirates".
Take UBI's DRM for instance, because it seems to be the one on everyone's minds these days. Assassin's Creed II was one of the first games to use it. Not only was the game out on usenet before retail, but the DRM was also smashed. If I can be permitted an anaolgy: Companies like UBI wants us to think of DRM like a lock that they use to put on their most valuable treasures, and they want us to think that they're just doing what is necessary to defend their livelihood. So in terms of Assassin's Creed II, it's like they bought a brand new lock to lock up their priceless treasure, then someone came in, right in front of them, cracked the lock, made a master key, duplicated it a thousand times and started spreading the keys all over the sidewalk in front of their building with little labels on them saying what they were for. Now the reasonable thing to do would have been to demand your money back from the a-hole who sold you the lock that didn't work, and move your valuables elsewhere, but that's clearly not what UBI did. They just soldiered on.
Why? Because the DRM still works. It still does what they want it to. It controls consumers who play by the rules. No company in this business is naive enough to truly believe that DRM will stop or even slow "piracy". (There may be elements in the company, like CEO's and people distant enough from the concept and susceptible enough to BS propaganda that believe it, but I'm not counting them - they're just highly paid idiots.)
Otherwise, why would DRM be implemented to stop people from playing a game before the release date? Not all pre-release copies are unlicensed. Release dates are a function of marketing, not technology - especially in situations where a software is completed and sitting on a shelf for two weeks before anyone is allowed to buy it. DRM is about controlling customers.
Why would DRM require that you log into an Internet service to "activate" a software, or only allow you to install it a certain number of times? This is not to prevent "piracy". It is to discourage "sharing" via sneakernet, and it is to kill off secondary sales. They don't want the copy of the game you have to retain any value - they are attempting to make software behave like perishable goods - in other words they want your copy to be "used up" so that anyone seeking a copy is forced to buy it new from them.
Again, these are not things that affect "pirates". "Pirates" disable the "protection" scheme and just go on their merry way. You may think that "pirates" are just greedy bastards who want everything for free, but their efforts are sometimes the only thing tipping the balance in favor of consumers.
It is ironic that so many people who read posts bitching about DRM automatically assume that the ones doing the complaining are just frustrated "pirates". "Pirates" do not complain about DRM - IT DOES NOT BOTHER THEM. The people doing the complaining are either paying customers, or people who would be if it were not for the DRM.