Trials for the adoption of the He-51 biplane had been concluded. Even now, as the year 1911 entered its final season, Germany had managed to manufacture thousands of biplanes. The problem wasn't manufacturing these metal birds; no, that was easy and cheap to do, even on such a large scale intended for a global conflict.
Rather, the real expense in the fielding of aircraft was not only maintenance and logistic support, but primarily the fostering of those brave souls who would ride them into battle. That's right, founding a dedicated air school was expensive, and so was training pilots.
One couldn't just raise a single crop of these knights of the sky. They would need to be consistently trained over the years. After all, many would certainly die in war, and those who didn't would eventually retire.