I do care, I'd like to know about surveillance (whether I can do something about it is secondary). Knowing may allow me to modify my behavior. To your point ab

I do care, I'd like to know about surveillance (whether I can do something about it is secondary). Knowing may allow me to modify my behavior. To your point about reasonable expectation of privacy. On the surface, yes, you do not have a reasonable expectation of privacy in public, however, I do not like the idea of having my picture tied to identifying information like a mac address. It starts to provide a fuller picture of a person and would allow more data in which to build up a profile. At the end of the day I'd like to choose how and when my personal information is exposed (to the extent that I'm realistically able to control it)