Quote from: gyverlb on January 02, 2013, 04:10:51 PM

Quote from: parsa2011 on January 02, 2013, 04:03:23 PM

imagine there is a street in your city and diamonds are spread out there anyone can take them sell them and make money but they are 0.5 underneath the street every body is looking for them and trying to find more diamonds, you invent a machine which can show you where exactly the diamonds are, whats your reason to start selling the machine instead of looking for diamonds?!!
i mean it dosent make sense! it dosent look to be useful machine! why with unit which you can make 3000+ usd a month you will sell them for 1000+ u , and can make 3000+ a month you will start selling them instead making money with them?!

any idea?

That's been asked by many people before. The usual answer is that people selling mining tools during the gold rush where the ones making sure profits. The miners had diverse luck based on when and where they looked for gold.
This is the same situation now: selling mining hardware is a simple business model (especially if you use preordering), mining is more hazardous, being profitable depends on when you buy the hardware, when it gets delivered and when you sell your mined coins.

I don't buy this analogy. Bitcoin rewards are much more rational and predictable than gold mining.

The most rational business model at present is to use ASICs to mine not sell on. OP has it right.