Just did a GOG survey that focused on the idea of a paid membership option on GOG. Seems they're determining what people would be willing to pay extra for. Some of the options were
- a tool for backing up offline installers
- ability to install previous versions of a game
- extra insight into the preservation work they're doing.
- voting rights on games to bring into the preservation program.
And others that I can't remember.
1/3 of the Steam + Linux market, that accounted for an incredible 1.45% of Steam installs in February. This means there were roughly 67 Windows gamers for every Linux gamer (using Steam) that month.
So even if Linux gamers are 10 times more likely to care (and pay for) for game preservation, you are not even approaching the number of Windows users that might. Suppose 90% of Linux gamers care, while only 9% on Windows do, you still have roughly 9 Windows users for every Linux one. And this is a very generous assumption to make.
Maybe, eventually, at some point, this makes sense financially. But if your goal is to be profitable, you grab the low hanging fruits first, not invest in maybe 10% more potential users.