How did GOG get the remakes for Police Quest, Quest For Glory, Leisure Suit Larry, and even Gabriel Knight, but they couldn't get the remake of "Space Quest?" As someone who played the remake and not the original as a kid, it is unthinkable to play a version of "Space Quest 1" that does not have a cameo from the 2 Guys From Andromeda for some of the deaths.
It would appear that Steam is the sole rights-holder for the distribution of SQ1 VGA. Apparently there's some sort of exclusivity there for Steam that GOG was not allowed. However, I have seen some comments to the effect that the original EGA version is preferred to the VGA remake by some people (who would settle for nothing less than the original.) If you bought the GOG version you can wait for a Steam sale in order to purchase the VGA version, or you can go the Torrent route and get it that way *cough*. (My own opinion of the torrent route is if you paid retail for a game when it was new but lost your copy, etc., dog ate it, etc., you're doing nothing wrong by procuring another copy--as you've already paid a premium to the IP holder for your original copy.) That said, it really doesn't make any sense not to go ahead and get a copy on Steam/Gog for backup if nothing else, does it? (Especially on sale!)