People come up with weird stuff. It happens.

[Flippantly. His own choice of names were notoriously simple and unimaginative, so he had no right to talk.]

But a roomba....I imagine it would be expensive, looking at all of the stuff inside this thing. If it hasn't become standard yet, then there's no way a person would risk buying a novelty... no wonder they let their cats ride around it. It's a toy to them.