The larger context of Brad's post is to question whether the financial sector's increased share of GDP over the past six decades has contributed to economic growth. Given how much of the financial sector is no more socially useful than a casino, I don't see how that could be the case. Worse, the "house" and several of the "players" in this casino have used their growing resources to subvert our political institutions into believing that their institutions are "too big to fail."
Recognizing the casino aspect is valuable in its own right. The important next step is to recognize that these rentier activities are not only socially useless but overtly harmful.
I feel like a voice crying out in the wilderness.