What nobody seems to realize:
DRM only effects customers who bought the product in question.
There's only been a few solutions that delayed piracy, but in the end anything a human made is defeatable by another human.
Unless you go to war, simply in hope of delaying the inevitable seed ratio climb (E.g DENUVO) there's no point in DRM at all.
People who like your product, like your company, will buy what you're selling. People who don't, won't.
Giving pirates the upperhand with draconian, intrusive DRM really just means they deliver a better product than you when they remove/circumvent it. (UPLAY, Origin, I'm looking at you.)
If you want sales, you want loyalty, deliver a product that the customer falls in love with and can't resist.
Look at Bethesda for a classic example. I know I'm not the only one here who has purchased multiple copies (under multiple platforms) of Morrowind, Oblivion, Fallout 3 and Fallout: New Vegas.
Hell I even buy Bethesda titles I have no intention of playing. Simply out of desire to throw money at the company, from loyalty. (The 5000+ hours I've gotten out of Bethesda titles makes it worth it.)
There are, or were rather (Bioware, Blizzard) a few other companies who had this kind of player base. But too many cut corners, hoping their DLC scheme and self-delusional DRM ideals will save them, instead of trying to deliver a quality, WORTH WHILE experience. ($60 10HR games with $45 in DLC that require two or three seperate logins? Nope!)