Loki and LGP, for that matter.

The other Linux games however, I think are much more achievable. Unigine, for example, own the rights for the Oil Rush Linux version. All the Humble Bundle Linux games belong to the developers. There's quite a few games that would make it should GOG even lift a finger and try... not to mention all the games that would have been supported by way of Dosbox.

What if someone installs a self-made Linux distribution on their self-built toy car? How could GOG support that? Linux is just too dangerous, man, I hear you can install it on a computer and then unplug the monitor and still have it stay on the computer. Someone might do that and complain that he can't play now on his system, and you can't very well tell your customers to plug the damn monitor back in or buy one if they don't have one.

and it will remain so.

Hahaahaa, that's a good one. Some humour is always appreciated. My router runs Linux but I would not expect it to run games. 8MB of RAM might be enough for it, but it cannot even run Zork because it has a different hardware architecture. i686 Linux might be a better restriction. Apart from that, hardware requirements are listed with some games.
@Kristian:
Don't be so sure of that. Valve supporting Linux on Steam also raised quite a few eyebrows...Remember?
Besides, the company that managed to publish System Shock 2 has had bigger hurdles to contend with.
I think it is only a matter of time, especially since the MacOSX and the Linux platform belong to the same (if distant ) family. Just look at the Humble Bundle sales...

It also caused people to winge that their specific platform wasn't supported, so you are never going to make everyone happy. Valve is supporting Linux for strategic reasons, not to sell more games.

Somehow, I don't see it being the case with the stream of recent Linux-compatible indy titles that we're seeing.

Maybe once their IPs get resold, it will get fragmented like that, but not now.