Riekopo: If GOG was smart they would advertise what old games they update with wrappers and stuff to work better. It's the primary advantage over Steam and other platforms.
If the GOG wrapper ends up released with the old games when said games appear on Steam (since often GOG versions of old games end up on Steam, like Square Enix's old releases, the Star Wars games, Activision's old games, etc.), perhaps GOG thinks most people will tend to end up waiting for a Steam release, which is why GOG push the DRM-free aspect of their products (or Galaxy 2 as the "true" "all my games in one place" client).
But in general I agree it's a good idea, especially since it
seems like most PC gamers (the masses not already here) might never care much about DRM-free (unless something really bad happens to the internet) and there may not be much more audience to be gained in that area.