Our salary structure is designed to select for exactly the type of people we want to attract - the kinds of people that will go through walls to bend the world to their will, for some deeply ingrained reason unknown to anyone but them. For people like that, we pay an incredibly high salary that they're unlikely to find anywhere else (2.25% of everyone's contribution on the high end). If you're the type of person who wants to change the world and have a shot of building a one billion dollar business while doing it, you're unlikely to find a higher compensation anywhere other than choosing to start your own business.
If you're interested in having a stable, $200K job, RethinkDB is not for you. Neither of these choices is better or worse, simply different. It's a question of temperament. We weren't complaining, we were working to recruit great programmers who are driven to change the world. This is exactly what the post accomplished.