I left BT for the same reasons, the moronic sales women that rang me shortly afterward offering me 6 months free broadband had no idea what I was talking about when I mentioned Phorm, and my attempt to educate her fell on deaf (and dumb) ears.
Unfortunately if they did do focus groups you can bet they would cherry pick the least IT savvy customers they could find. As for Google and their use of this targeted advertising (spying) it will once again be the ignorant that suffer.
I inform everyone I know how to secure their surfing habits, unfortunately quite a lot of them don't seem to grasp the growing problem regarding security or their lack of it. :( These are the people that Google and their ilk are abusing and it’s sad that most don't seem to care. We will have to wait to see how far it goes before they remove their heads from the sand. I fear however that it will be too late by then.