sorry i am confused can someone help.  At those dividend rates and 2btc per 1 share, we are looking at 2 /0.00696732 / 4  = ~72 month to make back the initial investment and this assuming the difficulty remains the same which we know is not true as those asic boxes start to go online.

So what am i missing here? why are so many people paying 2-3btc for 1 share of asic miner?