Not only do the jannies do it for free, I bet Reddit could get them to pay to be moderators, in the same way that free-to-play games exist so that the "whales" (big spenders) can pay the game operator real money to have an unfair advantage over the regular player base.
As if there wasn't already an issue with corporate sponsorship of moderation in some cases.
This would destroy the eusocial for-free moderation by people who simply want to create an environment they value and others benefit from in the process.