Are master service providers profitable? Isn't it time MSPs asked?

I have always believed the master service provider business model to be unscalable. I also believe that master service providers have financially unsustainable models without continuous outside investment dollars. However, if everything is perfect with the master service provider model, it would be an excellent service to the industry if they all shared their financial numbers highlighting their success. The question is, what if they are not profitable? If some businesses get sold with...