They can't even retrieve each single book automatically, but must get 99 others with? That's a lot of wasted work there.
Also: barcodes? Which century do they live in? Even at our 'conventional' library they have tagged books with RFID so that you can borrow it yourself at a terminal and give it back as easily.
And they do it so they can store the books in 1/7th the space. I didn't think space was such a big problem for the US...
So in my opinion the price tag is a little too high for such a small gain.