Wishbone: Tell them to search torrent sites for some of the titles carried by GOG. They'll find them in abundance... But none of them will be the GOG versions.
I've done this exercise a few times by now, out of curiosity, to see if your lack of DRM would lead people to pirate your games. So far, I haven't found anything. I see this as a sign that customers are happy with, and respect, your chosen business model, and do not want to compromise it by betraying the trust you are showing them.
Not even Fallout?
That's interesting. I would have figured it wouldn't be too hard to find external downloads of at least the better-known titles. If we disregard the issue of whether people respect GOG's business model or not, I think there are several factors against it:
1) Crack groups have no interest in GOG releases (there's nothing to crack / brag about), so they aren't putting torrents out there. Why bother?
2) Lack of community interest. These are old games - most pirate activity centers around new, hot releases like Fallout 3. Old games are less likely to be heavily shared, and would also spread to other sharers at a greatly diminished rate compared to their original release.
3) Even people who are sharing the original cracked versions are not likely to go out of their way to find, download and share a new version, especially since the already weak distribution makes it harder to get the files without buying them.
4) If you've actually paid for something, and you're not a crack group looking for recognition, you're probably a lot less inclined to let a bunch of strangers leech it from you for free than if you got it free yourself.
Overall, I guess the people who are most likely to put these games on torrents or peer to peer aren't actually acquiring the games in the first place. All that said, GOG is still a new service. I'm sure somebody here puts everything they buy from GOG in their shared p2p folder, and I'm sure many have made copies for friends and family, but there probably aren't very many illicit copies floating around just yet. I expect we'll see it before too long, though.