Let it fail?
Companies will pay as little as they have to for any given service. Its not greed, its just their nature. They have been used to getting NTP for free for so long, they aren't likely to start coughing up funds out of the goodness of their hearts.
Harlan's efforts sound like they have been truly heroic, and at that heroic pace for a very long time. But I think he is flat out being taken advantage of, and will continue to be until he puts his foot down. Maybe just flat out refuse to work more than 15 or 20 hours per week on it, putting the rest of his time in to his consulting business or something. I know that $7k per month looks good on paper, but I gaurantee its not nearly as much in practice.
Let it fail. That will bring the needed attention as funding. Its harsh, and in many ways against the open source spirit, but the guy has been taken advantage of long enough. When Google and Apple and others aren't even chipping in a little bit, especially taking in to account the huge consideration he gave Apple, then the whole thing is just wrong.