I personally took a sabbatical precisely to rediscover my love for the craft of programming, on which I'd become pretty burned out. Travel was great, and I acquired a lifetime of stories, but I missed home and feeling like I was achieving something -- as well as the earning of money that I knew I was spending at a rapid clip.
That's just me, of course. I have long enjoyed programming, and am incredibly lucky to be good at a lucrative job. You might find that a year of climbing glaciers or weaving tapestries ruins you for the office job. I personally am well aware that if I were to pursue my passion for theater as a means of living, I'd come to hate it. So I dunno if my experience generalizes, but that's my $.02 for what it's worth.
(I can say that I'd heard a figure of $2M rather than $3M, and God I hope so. That burnout thing cost me over a decade of productive earnings.)