Exactly. I've worked both in France and the US. My salary was indeed double in the US. But with everything factored in, it was not really different salary-wise. Also, I have much more free time in France which is very important for me. I really loved the US for the whole living abroad experience and would go back in a heartbeat for this reason, but my quality of life is better in France (not in Paris though).
EDIT: (I also didn't have to pay anything for my education.) I'm a bit tired of those articles that announce a brain drain because France is supposedly so unfriendly to talented people or entrepreneurs. We live in a global world now and it would be a shame not to experience living in other countries. Doesn't mean that France is doomed to bankrupt because our economy isn't as liberal as it is in the US for instance.