im agree with buy coin...i'm a miner but i suggest you to buy coin.
i was pre order my miner on first of august, if i decide to buy coin not to buy miner
now i think i earn more then 150%
I wouldn't mine a coin with a payback period of more than a year
At the moment, the ETH or ZEC has a pay back of around 250 days, depending on the electricity price.