I think I've got to quibble with your second statement. If we take the portfolio of me that FB sells, for instance, I'd argue that its value actually does decrease the more it shares it. If FB has a relatively small, well-curated list of ad services to which it sells me I may then see well-targeted ads and click-through at a rate where the service is willing to pay FB $12 for me.
OTOH, if FB starts disseminating me willy-nilly, that drives up my aversion to the ads I'm served, drives up my incentive to block, may ultimately drive down my click-through rate, and therefore drive down the serv…