Aren't these all old ancient games? Why are the publishers so scared? I could be wrong but I think the people interested in this type of thing would be people like us: People who know a good thing when they see it and reward as such.
Publisher really shouldn't be afraid -- b/c old copies of their games ain't even getting them any money to be generated back to them b/c they likely don't keep the old games in print even. And b/c of this, Mr. PC Gamer sells his original copy of the game (that is no longer in print) for high prices and will profit on Ebay, Amazon.com, Buy.com -- or any of those places. Hell, just look for prices for SS2 and PST online from users and stores that actually have an old or used copy of them; they're HIGH.
Best of all, once CDPR gets a copy of the game's files, they just work their magic to get them going on Win XP, Vista, or whatever OS they want to support (if necessary). If anything, publishers with old games should see this GOG as an opportunity to make more even $$$ off an old game w/out even doing anything to it; hell, CDPR's doing all the freakin' work here by finding work arounds and stuff. Hell, CDPR and the publisher don't even have to press the copy on disc, which saves lots of money on printing discs, manual, etc; that's the gamer's job now, w/ the GOG Project.
I think publishers are thinking this -- they are afraid the GOG DRM-free copies of the game will make it on the Torrents -- and then not too many nor nobody will buy any copies of it directly from off GOG. That's why publishers are more likely to support STEAM w/ their older game catalogue than say GOG; b/c it has its own style of copy prtoection attached to it.
Since there's no DRM here, publishers are also afraid a user of GOG will just make a copy for their buddy; and that buddy will make another copy for another buddy; and the chain continues so forth and so forth.