Look, I've bought a KnC jupiter batch1 when 1BTC was equal to 108$. It cost me 7500$ (jup+psu+delivery) ~= 70 BTC.

Since I've received the miner I started to mining for a total of 52BTC as of now. I could have mined more, but you know, theory and real life are quite different: my miner wasn't fully working in the beginning (die 0 issue solved at some point), initial fw releases were sub-optimal, psu failures, pools downtime etc etc.

To that, add maintenance cost, energy cost.

As last point, I really don't know if I will be able to mine another 18 BTC before running my jup will cost me more in terms of electricity than the btc it will produce.

In retrospect I should have bought BTC without any doubts.