One thing that I don't think anyone mentioned is that flying low is good for avoiding the flow of fixed wing traffic. Obviously we aren't talking 30 or 50 ft AGL, or even 300-500 ft AGL. But certainly 500-1000 ft AGL is a very comfortable place to be. High enough to make finding a spot for an auto easier, high enough to avoid most wires and other obstructions, theoretically high enough to avoid UAVs, more friendly from a noise point of view, but lower than most all fixed wing aircraft.