Let me tell you a solution for the "FIX IT NOW" types:

> This is an Open Source project that gets developed at the author's discretion. We provide paid work services for urgent fixes, cost is $500 per day with a minimum of 4 days.

Put that in the README, under a header that can be linked to in bug reports from entitled people. Worst thing that could happen is that the maintainer ends up earning a couple grand.