It's partially a function of geography though - not every area is as amenable to this approach as others. And you may need to change approach if this really isn't working. If it's working for others in your area, and not you, it's probably something in what you're doing (or not doing). If no one is having success in your area, it's likely more geographic area.

Happy to take this offline at mgkimsal@gmail.com if you or others want to dig a bit deeper.