10% was an example of a low-ball number. I estimate the number is much higher.
> I do not care about the moral judgements.
If you don’t care about moral judgments, why have this conversation at all? Nothing matters, do what you want, pirate everything you can get away with.
I don't care about the morals of pirating in the abstract, because I don't think such an abstract morality makes sense and hence I am not gonna lecture people what they should do (they can decide themselves based on their situation). The argument that without some sort of abstract moral code one will just pirate everything makes no sense. I buy now the games I play because I am fortunate that I have the money to buy them, and because I want to support studios that I consider decent (so that they keep making decent games). Same with any other kind of art.
Pirating is far from a "choice of convenience" nowadays. Getting a pirated copy is much more complicated than getting it in gog, you do not get updates (I assume you have to search and install it again), and involves serious risk installing malware. Especially with how bug-ridden new games tend to be nowadays, I cannot imagine getting a newly released game without some form of auto-updater.
A lot of successful DRM-free games exist, and games that have DRM are still pirated just fine. Pirating existed in games since ever. It is not for the lack of DRM that a game may fail to sell.