These days when people talk about DRM they are usually only referring to the annoying net dependent type, such as Steam or what EA now uses. I have no problem at all with disc checks and cd-keys. Never has this method made me unable to use a game I bought. I remember the outrage with Starforce, but I never experienced any problems with it in any of the games I bought that had Starforce in them.
If all these games that require net activation didn't have it,.. then I would probably consider buying them.
Net activation is a hassle. Maybe not to you,. but it is to me. So they are losing sales to me and other people who don't like it.
ALSO about used games. GOG is cool because they've managed to be able to re-distribute older games and have them be compatible on new systems.
But there are plenty of older pc games that have not been re-released. I often buy these used off of Amazon. A lot of these games were made by devs that don't exist anymore. Some of them were published by publishers that aren't around anymore. I'm glad I'm able to play these old games that aren't available as new anymore.
If game publishers keep making their games inconvenient to use with overly restrictive DRM and calling their consumers criminals then I have no problem at all with not buying another of their games again if this is the attitude they present to us. Video games are not something I can live without. I have no problem with not supporting certain companies within industry if they treat me this way.