When you first do the math it is very easy to say, I can work overseas for 8 years and that will equate to a 20+ year career in the USA based on taxes,allowances etc. Unfortunately, it does not usually work that way in reality and in most cases you give up significant QOL and family ties for the almighty $$$. Furthermore, you have zero protection should you have any hiccups along the way. You are only as good as your last flight and there is no real job security as an expat pilot.