You're right, I think there's too much money for the SEC to go in and clean house. While the MM's are needed in the OTC, they also have too much power and the ability to easily manipulate. I'm not sure how it ends either, but there do need to be some changes made.
I agree. Most of the firms who make these transactions and route trades work together.
When you reach a certain status, usually in the $$billions, there are small teams who are paid discretely by elite insiders to spread information around to these firms.
The markets are ultimately controlled by the wealthiest institutions and investors.