You agree to have them installed, they save you electricity, and PSO gives you a break on your bill. Not that big of a deal.
Oh I agree, I am not asserting it's a big deal or invasion of privacy. Just pointing out that some people are already voluntarily ceding some control of their usage and appliances to the power provider. I'm not one, but then I'm pretty conservative with my thermostat (My wife on the other hand...).