I'm fine with buying games on Steam, but I won't pay more than $5 for a game with DRM. I guess I'll have to wait until it's more heavily discounted.
I don't think that's really the point here, or at least, it's not the major point. The Windows version is available on Steam **and** GOG (DRM-free, no online activation, no required download client). Why wouldn't the Linux (or OS X) version launch on GOG as well?
On the one hand, they're a private company, so they can do as they seem fit with their product, but from a money making perspective, why would you choose to limit your potential sales? My spidey senses are tingling now....
In any case, I'll await the GOG Linux version...would've paid the 28$CDN for it too Aspyr! :P