It seems to me with many brokers you can't reasonably & profitably buy at bid & sell at ask, because the broker is in charge of your order flow, and almost always steps in (by offering fraction of a penny price improvement themselves, or through some third party) when they assess it's the type of stock worth playing this market making game.
Do you know of any broker that does not take over your order flow. and/or that gives you a fair chance to buy at bid & sell at ask?
Do you know of any broker that does not take over your order flow. and/or that gives you a fair chance to buy at bid & sell at ask?