But. That's the thing. They CAN 'bugger off' home at any time. And often do. If a particular market maker can't work for some reason with some particular symbo

But. That's the thing. They CAN 'bugger off' home at any time. And often do. If a particular market maker can't work for some reason with some particular symbol [there are thousands of symbols], at some particular time, he would just pause. And they often do.