The problem is, i made the calculation for an industrial mining operation. Something like the megafarm of KNC, not for the casual hobbyist. The other problem is, we don't know how expensive the miners are to produce. We don't know how much profit a company like KNC makes per miner if they sell it to a costumer. Maybe the production and assembly cost is only 300$? That would explain their insane profits.
> i made the calculation for an industrial mining operation
lol, only electricity cost 15% or 19% more every cycle makes 4% difference per 14 days what is 277% per year (a huge difference if I'll sell bitcoin for $500 or $1500)
It is not same as hobbyist lose $200 USD (if you invest $100M USD then make loss of $200M USD will be significant)
> assembly cost is only 300$
you need to build infrastructure ( factories, cooling )
thunderbolt can strike to you mining facility (you need insurance)
thief can attack your mining facility (you need security service)
... and more 24/7 services are required to get your business running