Probably because the cost of the mask writers is so huge. As the article says, only 10 - 12 mask writers sales are expected in 2017. My guess is these machines

Probably because the cost of the mask writers is so huge. As the article says, only 10 - 12 mask writers sales are expected in 2017. My guess is these machines will run 24/7, practically. The more masks it can make, the more units over which you can amortize the capital costs.