No, I don't think this a description that fits on how the SB market is operating today. The price they quote must reflect the movement of the underplaying asset. They cannot as you say, quote any price they want. This is also the intent of the MiFID financial directives, which most SB companies have today signed up for. There is of course cases, when a SB does not behave accordingly, by not following the rules applied by the industry. Sure, they play games at times, and as you say, make it very hard to exit a trade or give too many re-quotes, freezing and such. But by large it has been an improvement over the past years, and I think this will continue as competition is increasing. SB, being market makers, one must include risk of misuse in your personal risk management profile, by having a backup if something goes entirely wrong. This includes for example, being able to hedge your position at some other SB. Also applying trading disciplines as, restrain from yourself trading when the risk is increased, such as during important news releases.