If you're wanting to build your own miners for BTC, you're either gonna have to go to an existing manufacturer like Bitfury with at least $1M for an order of their ASICs, or come to an existing IC developer with about $10M (and around six months) to run you out your own custom design. Unfortunately the only "realistic" course - unless you have a whole lot of money you're willing to risk losing entirely - is to buy existing miners from someone else.
Interesting, ok great feedback thank you.
I'm not opposed to these options so long as profitability looks reasonably positive. I would prefer though to star with a smaller operation to test things out first, which leads to the "buy existing miners" option, however each time I do profit/loss analysis I seem to come up negative due to the reasons I listed above for this topic.
Have you purchased some existing miners before and came out profitable despite the list of expense items I listed above?