Bitcoin exploding does not make a Bitcoin mining ASIC paid for in Bitcoin mine more Bitcoin. On the contrary.

When it comes to getting the USD back, sure. Even if the machine only mines 10 BTC in it's lifetime it is likely a matter of time. Just hold and you will most likely at some point see ROI in USD. But that is beside the point if the initial investment was in BTC.

If you sell a box for 50 BTC that produces 20 BTC over its lifetime (while eating energy and making noise), it does not sound like a product you can build your business around. Yet that is exactly what we have pre-ordered now that delays are a reality.