"Now, about this plan of yours...where is the GOOD part? (And I know I will be downvoted...but honestly, did you think this through?)"
First, your premise is flawed. AT&T are greedy bastards, and already will be making a profit at the lower price, with 0 ads. The ads are just ADDITIONAL profits, not money they are counting on to operate the service. The $29 (or $44, or whatever) fee is just additional money they are charging because they can. If they get no ads served, they will not raise the price. They are charging monopoly pricing for gigabit service, see all these other markets where Google is already there, and AT&T's pricing is magically much lower than it is in Silicon Valley.*
Second, I don't want any ISP (or anyone else) sniffing my traffic; this is greasy at best. And injecting content into websites AT&T does not operate should be (and possibly is) flat-out illegal. If AT&T wants to put ads wherever, they should deal with ad brokers like everyone else.
*I'm waiting for ANY decent service here... CenturyLink (DSL provider, who does not allow 3rd party DSL on their system) and Mediacom (cable company) effectively run a duopoly here, with pricing so high that the usual "expensive last resort" of satellite internet is actually price competitive with their offerings.