If you could clear $450,000 per copy, I'll bet you would make as many as you could.
Then again, we are talking about a negative made in the early 1940's that was printed until the mid 1970's. Don't forget, Ansel employed a series of assistants that made most of his prints. And if you look at the list of Ansel's assistants, you will see some really, really good printers.
I do believe that the number of Moonrise prints sold is closer to 1,000 than 200.