My hypothesis: people who are already using VPN egress traffic in IAD (which has the largest AWS region), thus the results based on IP address is skewed by people who actually live in other countries or maybe even continents.
Wouldn't int'l users choose the location closest to them? If you're in China for instance you're probably going to be using SIN or TPE. Besides, most VPN providers avoid Amazon and use colo providers that give much better deals on bandwidth.
