Of course, I can't figure out a good reason to get a DVD-rom drive either.
CD-Rom drives are cheaper, faster and quieter. They also work better as a source drive for CD copying onto a CD-RW drive.
Personally, I'd rather watch DVD's on my big screen TV, mondo surround sound system, and Apex all regions, defeat copy protection, DVD player. The Apex allows me to max S-video VHS tape recordings as well, defeating macrovision. I've done that a number of times and the quality is excellent. Not quite as good as the original, but close.