Thank you for your comment - I really appreciate that you engaged thoughtfully with my question.
I understand I could make a massive amount (relatively) of money specializing, and to a certain extent I am, but I truly hate the market's insistence I be a one-trick pony. I'm willing to accept a lower standard of living to avoid this. I want to focus on other things in my life than the problems my boss tells me are important.
EDIT: I'm a big fan of ERE, if that tells you anything.