The average family income is something like 37K, so I’d bet that 50K is definitely in the top tier...
Now, I wish this damn “alternative energy” dude would just STFU....blablablabla
According to the U.S. Census data, the median household income for 2010 is just over $49K.
So I highly doubt that the assumption that $50K puts you in the top 10%—he must have meant something else.