You can already find 'bundles' in our catalogue - Descent+Descent 2, Descent 3 + expansion, Die By The Sword + expansion, Freespace + expansion, M.A.X. + M.A.X. 2 with Redneck Rampage Collection arriving shortly and more coming in the future.
Not to mention that you can download bonus content with every purchase (wallpapers, avatars, game guides, soundtracks etc.) which I think is a pretty good deal as well. =)