The bank staff is paid salary, not commission, so it is in the bank employee's personal interest to not sell the property too fast, especially when it incurs a big paper loss for the bank. (Job security)
While the goal may be to appear to maximize value for the bank., the need to be able to document and justify the loss is the stronger motivation than a quick dispostion. .
You and I know that the bank loaned more than it should have, but the bank officers that made the original mistakes may still be in the banks employ. The CEO most likely is.
They gradually lower the price, in small decrements, as no offers or low offers come in. Finally when the list price is at or near the real market value, it can be sold.