Is the $15/mo use it or lose it, or just a maximum amount? IE, do all your monthly subscriptions add up to $15?
If I'm paying the same as the bidding cost for advertisers, then I'm all in, this is super sweet. If I'm paying some vague hand-wavy fee that reduces my ads, but doesn't correspond 1-1 to what advertisers are paying then forget it.
Any unused money rolls over to the next month, according to Google [1]. I've been using it for months at $15/month and I've never seen it not use all of the money. I do use the internet constantly at work, though, and see many websites.
Don't you feel a bit ripped off? Why does google get to keep the extra? How do we know they aren't still showing you SOME ads, just not all of them, and the price for that is $15?
The way I would be in 100% support of this would be if I could go and "top up" my ad-support-budget. Say I add $50.. and from then on every Google served ad gets swallowed up and my balance gets deducted whatever the bid price was, with the same % going to the contributor site.
When my $50 is up, ads return. I can choose to refill as I want, or set it up to auto-refill with $20 when it runs out, sending me an email or whatnot.
I really really really like this concept, but man, they need to be really honest with their implementation.
There's a sliding scale that goes in $1 increments.