I view Google Contributor as a bad product offering, as it doesn't give me any guarantee.

Matt Cutts wrote that it works like if I would be bidding with an empty ad, but Google ad system works by CPC, so actually the product should be free in theory :)

Google exactly knows my long term value, so it could ask for that amount of money. Also it's for AdSense / DoubleClick, not for Google.com, where ads matter the most.

So my bid just drives up the prices advertisers need to bid to show me ads? Sounds like a win for a company that sells ads.

Asking for your "long term value" is interesting, although for users who run ad blockers and therefore never click an ad, isn't their value super low anyway? Imagine Google asking for $50/yr to not show ads, installing an ad blocker, then a year later seeing Google ask $5/yr as your value plummets.

Don't worry, Google is not that stupid :)

It could just use my interests to predict how much I'm willing to pay for getting rid of ads.

Or even the type and number of devices that I'm using Google on should be a good enough predictor, or just the country (which is the case for Youtube Premium).