Pay $10 to disable the cron job running yet another pile of 3rd-party code on a production server, even if it was (eventually) just for a year? I don't see it as a "never!".

The market is probably (a) people who want to support/donate to LetsEncrypt and (b) people who are ultra-paranoid / strongly prefer less moving parts in ops.

The one major downtime I'm aware of so far (a month ago) could also be a factor: Let's Encrypt is down | https://news.ycombinator.com/item?id=14374933