In fact, it’s not unlikely that the behavioural data of people who pay to opt out of being spammed with ads will be more valuable to data brokers.
True. This is why the AdNauseam extension doesn’t simply “hide” ads, but it goes out of its way to actually simulate clicks for ALL ads, causing algorithms to be unable to more accurately profile you and making the pay-per-click model fall on its face. If everyone did that, advertisers would have to pay for completely meaningless clicks making it no longer worth it to advertise this way.
Though it’s still not a solution to privacy, since it still gives some insight on your tastes by allowing them to know what websites do you frequently visit.