Okay first off did you read this article :
http://www.tomshardware.com/reviews/bitcoin-mining-make-money,3514-10.html ?
Avalon rigs and the ever-expanding ASICminer mining farm, and it’s easy to see that the best estimate for the global hash rate in late fall of 2013 is about 1000 TH/s. You're looking at ten times the current hash rate, and thus ten times the current mining difficulty. If an Avalon rig currently nets, say, $8000 per month, the revenue will soon be a mere $800 and decline from there....Thus, it is a fool’s errand to bid $20,000 for a pre-order of a 65 GH/s Avalon box on eBay. By the time it gets delivered, you will not be able to earn your investment back.
Basically if you started at the beginning of the article, you will see the 'buy in window' to be a miner was a year - two years ago to get in while the cost of hardware (say $600) plus ELECTRICITY (a very high cost it seems, including all the A/C to pump and keep the entire room from catching on fire) would still allow to make money as the bitcoin rose, but it 'crashed' (like everything else) and was worth 1/4 the speculative value. So coming in now you need serious investment or divide the profits (farming) in a distributive computing model to achieve the level of computation. Especially as the chart show in the past two months the 'computational effort' TRIPLED in difficulty in order to 'mint' new bitcoins (mining). So if your hardware made you $100 a month in Aug, now your making $30 or less per MONTH, and your electricity costs are still coming in each month as well.
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