dont forget that in 2016 btc income from mining will be half
but the value will be also very high, the current value already is about 100% more than what it was, so easily at this point will not count anything, incomparison when we were at 230
The price of bitcoin is not certain to rise. That is just a speculation. But the blockreward is going to halve, that is certain.
For this it is a big risk to start mining now.
Sure you can profit easily for 6 months.
But.. then what?
6 months in mining is a HUGE amount of time. There will be a next gen likely in that amount of time. I mean everything changes in that amount. I likely will sell some miners in next 6 month's of old generation (keeping S7/Avalon 6). But sell them to very low electricity or free electricity users.
Also you act like 1 time profit is not good. I would say take 1 time profit and then look at doing it or look other things next. You don't pass if your for sure you will profit. But mining has not been for sure for a long time, it's just very individual.