More importantly, sometimes DRM itself might be the reason why people don't want to buy your game.
This, and 100 times this. I own legitimate copies of excellent games, but I still run the cracked versions because of one important DRM technique of the time period: requiring the disc to be in the drive. My main computer is a laptop, and I am always on the go. I rarely sit in one place, and while I'm often seated in my living room, my PC games are upstairs, since they are rarely used. I simply do not want to carry the disc on me, when I have the harddrive space to hold the entire game. It isn't necessary, and it is cumbersome enough for me to buy the game and run the cracks that would allow me to not need the disc. First, carrying the discs sucks. Second, spinning up a CD drive is loud, and can be slower than just as easily reading from the harddrive. Third, having my optical drive spinning while I play drains my battery life and heats up my machine unnecessarily. Fourth, running the game from a removable drive is very useful if you move from machine to machine in a public area, like a school, so cracking it to do so is desirable.
These are all ways that local DRM frustrates me. I was very leery of always-online DRM when I started playing Phantasy Star Online 2, for one very big reason: I played Phantasy Star Online in the offline single player mode intermittently for many years! Dealing with the fact that if I wasn't connected to the Internet, I could not level my character was a tough hurdle, when I had been playing the game's predecessor for 10 years. However, I eventually accepted it as a necessary step (PSO was filled with hackers and cheaters).
So, let it be known that there is yet another type of customer: if you sell your game with DRM, and I buy it, I will still try to break it to remove the burden that was imposed upon me, despite me doing the right thing. I was very glad that the versions of Quake I, II, and III: Arena that I have for Linux install and ask that you copy the data from the legitimate Windows discs to the install directory, instead of requiring that the disc be in the drive like installing the Windows versions. I own the Ultimate Quake collection, so that is not the problem.
Edited by Ectara, 25 September 2013 - 10:47 PM.