Could you elaborate on this statement? It is my understanding that the value market markers provide is liquidity and tighter spreads. Worst case, they pull orders when informed volume is detected, but then the book is no worse off than what it would be if the market makers weren't there.
The liquidity is something that the exchanges want so they can provide better services to their other users / customers.
What the market makers get in return is some privileges on the exchange, such as favorable credit exempts or short sale treatments. This depends on the exchange.
But being a marketmaker, basically obliging to be able to quote a price on anything and everything, is regarded as much as a nuisance as it is a benefit.
Yes. And I do not see this as a boon. It reduces the cost of trading for traders at the expense of _everything_else_.
Eg: search for 'whack bully oil prices'.