When ToAU was released there were a lot of torrents going around for it. You still needed the actual game for the keys of course, but people used that to avoid the DVD issue. I doubt any such torrents are still active.

Also, DVD drives are pretty cheap these days. You might as well get one for your computer because it is an increasing trend for games to come out in DVD version only. Not to mention a DVD is less of a pain in the butt than 3-6 CDs for a game.

Remember 3.5" floppy drives (or 5.25" for that matter)? Those things are relics. Everyone upgraded to a better medium and it's all for the better. Technology is moving faster and faster, so it's best to keep up with the wave or you get washed under.