After aquiring my first D7000 (the model was then about 18 months old I believe), I tried to purchase the "adapter"/replacement battery.
At that time, it seemed like nobody in South Africa stocked it, or even knew what it was.
However, while I probably don't take as many photos as you do, I have never managed to flatten more than two batteries in a single day. And I currently have four.
IF I don't use the LCD much, I have achieved over very nearly 2000 photos on a battery, which I think is quite remarkable.