The point is that the work incentives are diminished at your high income. The value you are creating that is being compensated for at ~$250k hits a glass ceiling. You aren't exactly losing money, there's just no point in working more at your highly specialized profession.
The author of the original article doesn't quite understand this point.
The author of the original article doesn't quite understand this point.
A blog post by (right-wing) Harvard professor Greg Mankiw clearly explains this: http://gregmankiw.blogspot.com/2008/10/blog-post.html