Here is what Bitmain does.
1-They manufacture Antminers.
2-Keep the production of newer units “secret”.
3-Calculate very thoroughly when to announce and sell them so their costumers will be (or think they will be) able to make some pennies.
4 -Dump their used equipment on the market by batches as the new version batches comes in freshly manufactured.
Conclusion: Unless you have privileged access to miners or free electricity, avoid mining.
Invest directly in Bitcoins.
Sending 1 BTC to Bitmain to get miners might result in 1.00xxx BTC. Why is that ? Because Bitmain sells the Antminers very close to the amount of BTC it will be able to mine in the future considering difficulty.
Hours of work for close to nothing.
Blockchain – Crypto – Currency infomation