Earlier quoted context omitted.
> The extra money will come from people not wanting to watch ads. Having both an ad-supported and paid ad-free versions of the same product is likely an unstable equilibrium— Customers with disposable income will gravitate towards the ad-free product, and those are the people that advertisers are really paying for access to.
Why would a streaming provider not offer the customer an equal cost to not be advertised to, that the advertisers are paying to advertise to? Plus, I would still expect ad free to allow an ad before the show starts, although its often an ad for other content, a la Disney Channel only playing ads for other Disney channel shows.
If enough viewers that actually buy things move over to your ad-free product, you tank the value per impression that advertisers are willing to pay. Thus you lose not only the impressions of people who pay, but also the lower the value of each ad you’re still showing.
I suspect that this will cause most providers to be either primarily subscription or primarily advertising, to the extent that the less-popular choice doesn’t have enough customers to be worth keeping around.