Bitcoin Forum

Hi all!

Everywhere on forum I read that mining is bad investment but from my calculations it is not:

from this calculator: http://bitcoin.web-share.nl/
said 50 GHs mines 1.2BTC per month

on cex.io 1 GHs cost 0.07BTC so 50 will cost 3.5

after 3-4 months investment should return and than is pure profit for life

where am I wrong ???

You assume that difficulty won't change :)
Once/if  Cointerra, knc, Hashfast deliver their miners you won't be making that much anymore

This is a very rough estimate , on 50gh at a cost of 3500$ and a difficulty increase of 30% monthly.
http://mining.thegenesisblock.com/a/f87aca7a3c
Play with it.

you need to take into account for difficulty changes and price for GHS changes

The difficulty will change and this is a bad idea for now because  if you are buying with BTC once the rate crashes, you would have spent 3500 USD to get 50 GHS and mine only 1 BTC per month which may only be worth 300 dollars then or whatever the rate is at.

Since bitcoin is modeled on any natural resource, like the chemical element Gold.
The size of the lead shovel = GHashs/s determines the difficulty.
Since the shovel size follows Moore's Law, the price of production or acclamation closely tied to shovel price.