Because it doesn't work. Your domain name is bookmarked in a hundred million browsers, search engines, linked in a million pages around the world. We do this with email now, for example, with a minimum of fuss. If your domain at essential.org was cut off, they wouldn't reach you. Wannabe registries would love to move to value-based pricing, and will use any opportunity to move in that direction.
Consumers welfare, on the other hand, is served by cost-based pricing.
For Profit registries.