Amazon has shown us that even massive amount of data aren't that useful on their own. They can't even use their information about our online purchases in any meaningful way. Only book recommendations seems to work, but that's also pretty trivial to do.

The plans for my house isn't even secret, you can go to the county and get a copy for the cost to the paper. Maybe I'm not creative enough, but in what sense does the data collected by Roomba help you in anyway? Wifi coverage? Maybe they want to sell me an additional AP?