This (price) is the problem. Cheap ISPs like Plusnet are driving the price right down, now nobody want to pay more for a better service. This in turn shrinks the market for said better service, and makes it's price even higher. I noticed on Plusnet's forums that there were almost as many complaints from existing customer upset because they can't get free broadband like a new customer, as there were people complaining about the poor service.
For me the price wasn't such an issue, on a 20CN non low priced exchange I couldn't get any of these dirt cheap offers anyway, and on a slow line I don't need hundreds of gig per month. So A&A works out £7.50 pm more expensive, I've saved £4 of that by moving the phone line to Pulse 8, and could save more still by moving the line to A&A which would make it effectively no price increase at all.