Actually they do; banks can create new money. It is practically impossible to compete with an institution that can create new money when providing capital. It is called Fractional Reserve Banking and only licensed institutions can do it as far as I recall.

I'm not intimately familiar with US markets, being Australian, but the M2 suggests that half the money currently in existence was created since 2007. If whoever is creating that money doesn't have a stranglehold on providing capital they are going to, at a minimum, have massive influence. It is worth focusing in on, it may only be half the money in the system but that is actually a big deal.