You're In Control
Aside from the obvious benefits this would give you far more flexibility in you accepting offers or setting your sale price. You are in complete control of your sale throughout the whole process and have direct access to the purchasers or their solicitors. You do not have to suffer the frustration of waiting for calls back from the estate agent. The most important fact is that no one knows your property as well as you, an estate agent does not have such a strong vested interest in selling your property as you do.