examp-le
1.82$ earned by first week.
bitcoinfrenzy.com 2GH 99$ 25% reinvestment.
Calc shows only 0.002686 btc first month.So 0,0020145 btc to you 0,0006715 btc for reinvestement on first week.
What am I missing here? Or do they really sell unprofitable contracts?
Also isnt it better to just mine them themselves with all that gh/s combined? 4gh/s is
more than twice as good as 2gh/s right?
there are more examples.
It depends, I run a contract mining site and in the long run it is profitable. I think you have to look at it more in generating BTC versus generating BTC to convert back into fiat. I know, I know, you buy in with fiat to start mining. I think have to go into mining with 2 things in mind, A) high risk and B) you're in it for the long term.
I don't think anyone starts out selling a unprofitable contract. If the price of BTC falls too far, yeah it might be unprofitable depending on if BTC is falling against the dollar. If you're looking at converting BTC into fiat right away, just buy coins and don't mine, buy low and sell high.
Mining on your own causes all sorts of issues, using too much power, generating too much heat, unreliable power and spotty internet can cost you a lot of BTC. Some people aren't tech savvy either, they just want to mine with no hassles.
Just my opinion, I don't think contracts are for everyone.