Hi,

I have 30k to invest, so i think to build a mining farm.
I selected this hardware :
- ANTMINER S7 * 25 -> 22401 USD
- APW3-12-1600-B2 * 25 -> 3500 USD

Since kWh is a bit high in my country (0.16$), i found that miner hosting can be a good idea. I found 3 interesting offer :
- http://zoomhash.com            -> 0.08$
- https://cryptominer.ca          -> 0.09$
- http://bitcoinasichosting.com -> 0.11$

Then i decided to use different bitcoin calculator to see the "possible" profitability, using the shippest hosting provider (zoomhash)

On coinwarz.com :


On tradeblock.com :


On bitcoinwisdom.com :


coinwarz don't take difficulty increment into account, so i assume the result is almost false.
On tradeblock and 20% difficulty increment, it's not rentable. With 7%, i can use the bitcoin earned + selling the x25 rig to built a new farm with more rig (and repeat the process regulary, adding more and more rig, x25, x35, x50 etc...).
On bitcoinwisdom it's not rentable even with 7% or 20% difficulty increment.

I know bitcoin mining is very difficult and there is a lot of factor involved (ive readed a lot of topic in this section), but it's appear that even with starting a new build rig with 30k and a low kWh price the profit seem impossible, or you need to be very lucky.

What do you think ? Invest or not ? Take into account that i have money, so if i lose 30k it's not the end of the world.