This isn't your ideal solution—as you've noted, DTP is currently OS X only—but it does work pretty well for me, especially when I'm thinking about a general topic and need to find information on it. I even wrote a post about the similarities between Joyce's method of composition / finding material and how Johnson uses DTP.
I was one of them and wrote about the experience here. The short version: they don't advertise their bandwidth throttling and don't warn when they do throttle your bandwidth. My roommate and I thought they'd be a useful alternative to conventional ISPs, but they turn out not to be.
Ceteris paribus, you can't get an equivalent used car with the overall lifespan of the new car; in addition, if you buy a used car that someone else would've bought for the same or a slightly lower price, the person selling the car can buy whatever they want -- which might not be the green car you would've bought.
In addition, some people want the lower hassle factor of a new car, with the low probability of breakdowns and the high reliability that such a car entails.