Depending on where you travel, your expenses can end up being less than when you lived at the last place you called home.

Being rich isn't necessary. Living below your means is a great way to build a cushion for emergencies... or for when you burn out and need an extended vacation. The only people who really have an excuse to be unable to do that are people making less than the poverty line. Anything more than that, and you can save.

Of course in this case the author is rich, having been able to cash out his early Twitter stock after their IPO, but being rich isn't the only path.