it's income, and if it's like BFL...you'll miss that boat. You won't be hashing until its not worth it. Buying a big ASIC is very risky. A month lost hashing while others have been delivered to drive the difficulty up is a killer. Lose you serious income.
This is the precise reason I could never purchase a Neptune, even at the special discounted pricing. At best we're looking 3 months away, at worst 6 months. Even 3 months away.. will 4 or 5TH be enough to break even? It's sketchy at best, and that's hoping BTC value rises.