MM's don't pay 10 bucks for trades.
Their is a ton of info. on the internet about them....possibly you need to read up a little on them since they do your buying and selling just like a broker on your pink paper.
They run the market, own the trade books and know exactally what they are doing, how many shares are bought or sold at what prices, etc. and also are usually smart enough to know when to run or drop a stock to their advantage to pick up or sell shares. Only thing they worry about is their margins and how to manipulate the traders to make them.
Either way it is a lose, lose for the investor. Consider the MM's as the Fox watchinig the Hen House!