I also have a robot vacuum cleaner, but I don't connect it to my network. Too much potential information can be gleaned from a floor plan and the obstacles around the house. You'll never get me to install one of those telemetry devices in the OBD port on my car for any company. I don't care how much money it will save me on my phone or insurance plan.
Is it all rational? Of course not. My personal policy concerning my personal data is a mish-mash of contradictions, because it's fatiguing to be on the offensive 100% of the time. For example, getting a Nest thermostat is something that I want, but I don't want it phoning home to cloud servers. It's heating/cooling data about my house. That's probably some of the most innocuous data you could have about someone, yet if it isn't self-hosted, I don't want it. Yet Maps has tons of location data on me, Gmail holds my emails, and I have plenty of conversations over Hangouts.
Contradictions all the way down.