The number will be lower than the expected lifetime revenue. You need to account for risk (and at AM level, 0.01% hardware failure or downtime means a lot), opportunity cost (as mentioned, 1 BTC in the blockchain...), and expected ROI for customers (nobody is going to buy ฿100 in profit for ฿100).

In other words, because AM is more efficient at mining than Average Joe, if we are approaching the treshold of sale/mining, I think AM should hold on to units rather than sell.

.b