“Comfortably” is certainly a matter of opinion. But that 17.3k is a purchasing-power parity average, targeted at HN’s largely rich-country leadership. The nominal average income per person in the world is 11.4k.

http://m.statisticstimes.com/economy/countries-by-gdp-capita...

So we have taken the usual cost of living adjustments into account, and the question is, do you want to live on the equivalent of 17.3k per capita US relative to the cost of living in most of the US — somewhere like, say, Pittsburgh?