On Steam, they won't be able to sell it otherwise. Also, the game is old. It had its run on all platforms back in its day, but HOGs usually last 1-4 months before going obscure, with only a handful of exceptions.
I meant that it is one of their best games, showcasing their portfolio with it is always a good idea, since new customers and players can always pop up. Considering that most of their current HOG payload comes from Brave Giant Games, who are a mediocre to sub-par HOG developer on their best days, putting in the much better old Enigmatis series (and Grim Legends) can still give a higher hope of getting future buyers on other games/bundles than trying to convince people only with Queen's Quest…

yeah, and I'm always happy about that - if we're talking about hog games made in an acceptable way at least xD I've found lots of awesome hog games, many of them indie, on Steam so thanks hope to make some good giveaways in these days =) and to keep some nice hog for me =P