Or, I'm a poor graduate student whose income needs to be spent on silly stuff like housing and bills and food and books, which eliminates almost all of my meager income before I even get to luxury items.
As an aside, personally (as in, talking about myself), I don't see the point of me getting TiVo when I don't have digital cable, or for that matter normal cable, and my television is at least ten years old, only has one composite jack, and it doesn't even stereo sound.
If I had the money, I would definitely upgrade, but what I'm getting from my school (standard grad pay, pretty much across the country) is only marginally better than minimum wage, and that's if you assume I'm only working forty hours a week, which isn't even close to the case. Heck, even as a post-doc, I still won't get paid much more than I do now.
Also, fast forwarding through commercials via VCR is still pretty disruptive.
However, the second part is exactly my point. This episode, and show in general, runs a lot better without commercials every eight minutes breaking it up.