If Crystal gave an option to "allow high-quality ads" and then that list of high-quality ads was curated carefully in the users' interests, it could make sense.

If Crystal gave an option to "allow high-quality ads" and then that list of high-quality ads was curated carefully in the users' interests, it could make sense. But as soon as people start paying to be included on that list, it's not a list of high-quality ads, it's a list of people that have paid you money that you have decided meet some minimum bar (that you have incentives to keep low).