Which is only as secure as the door frame it goes into, which usually means: pretty insecure.

Still, I agree with the premise that it's about assumptions, and if people can be made to realize that their garage door openers are inherently pretty insecure, and feel that that presents a substantial, then there's a market there. But until it becomes a problem that's common enough for media outlets to scare people about it, there probably isn't a large market yet.

(Any marketing plan for an endeavor like that should have a PR budget from day one, since that's exactly how such stories tend to become news segments.)