alt Hacker NewsBlackmail for one: "I'll wage a campaign to flood the Internet with pics of your half dressed wife unless you....". That will work on some people, discovering extramarital affairs, or proving you know intimate details about the inside of someone's house, along with threat of physical violence will work on others. You just need to be sufficiently creative. You can parlay the successes from one target to the next: "I can get both of you divorced unless you install the rootkit on your work's network"
I will reference a quote I originally heard on HN years ago, though: the audio surveillance is magnitudes more valuable than the video.
Maybe I'm just not paranoid enough, but when people are having sexy time, they are not really likely to be running the roomba. Having that thing running is the opposite of sexy. When the thing is parked on the base station, it is facing the wall. So exactly how frequently do people think a roomba is running to be capturing all of this explicit footage?
To be clear, I'm not saying footage can't be captured, but some of these examples are just bat shit crazy well beyond paranoid