I like being the customer rather than the product, so I'm probably going to sign up for this, but the "exception" shows, even if there's just a handful, are tremendously insulting. Are those seven shows so expensive, and their ads so lucrative, that you simply can't afford to show them for $12 a month without any ads? Then charge $12.50 or $13 or whatever it costs. Heck, you can even price it at a loss, since a lot of people who will pay probably only watch a few--if any--of them.
I'll probably still do it despite the insult since they're only bookend ads (and I only watch one of those shows anyway).