confirmed. there is a hidden dev fee. Tested it for fun on 120 s9s. see the saw in the image https://drive.google.com/a/wisdek.com/file/d/1fqepQQMsHyJ6P6d0kCZ0qebfgbDzx4oA/view?usp=drivesdk

I would not mind buying it without dev fee.