Exactly!

Personally, I would love to see the kind of offers companies would start to make for opt-in tracking. In a much cooler world, people would be able to sell their data, as subscriptions, to companies, with premiums placed on more 'valuable' data at whatever given time, based on advertiser interest.

Of course, no data tracking would be ideal, for me. But if someone wants to sell their personal data, they should at least be able to sell it for a market price.

Being able to see the market price of their data would also help people to realize how valuable it is, which would enhance privacy awareness.

Right? And it's not like the equation changes, for advertisers. The only difference in this scheme than the current one is that it doesn't allow for such severe money-pooling. Still some! Obviously facebook would have a great and well-vetted network of advertisers that they could connect you with, which would surely incur some maintenance cost. But being able to opt-in to someone's ad services would be just another way to prove the cost of a service (in this case, social media) to consumers. It's just wins, all the way around.

GDPR actually disallows refusing service to people who opt out of tracking.

Isn't this German law specifically, not the gdpr?

It does in fact disallow that.