You can do this for free, by using a software called VLC, which is a cross-platform video software.VLC lets you record what is happening on your screen.
self-servingly, i attempted to analyze the appeal of chatroulette in the Becker/Murphy rational addiction framework here, but i don’t think it really works.
the site is just weird, and think it will just be a short-lived, deeply disturbing novelty.
there’s boatloads of lemons, to be sure; not just obscene scenes, but also just people without their camera on.
however, since the cost of moving on is so low (just press ‘next’), the ecosystem can withstand a huge amount of duds in between worthwhile scenes.
The problem is that a good signal requires a commitment to reputation if you don’t measure up.