It's nice that you want to buy *today* at 0.05BTC/GHs, but nobody wants to sell you at this price. The only raw chips selling today (Bitfury) manufacturer sells for 4X that price, + you have to add the price for the PCB, small parts and assembly to complete the miner. To answer your question about what is the fair price right now: It's the price rational person willing to sell, and rational person willing to buy, agree on. That price can only be determined on the exchange, and if they can't agree on the price you have a spread. Currently that spread almost doesn't exists and trading is very alive, which means there is a fair value most people agree on - just check the exchange. The idea anyone will sell the miner at the price which is sure to give positive ROI is wishful thinking. The times when AsicMiner sells initial shares or Avalon sells batch #1 miner where a Bticoin infancy, they are long gone and will never be repeated. All further purchases of mining assets will be small (if any) reward.
So far you just appear to be a shill for cex.io. But I want to give you the chance to prove me wrong. Let's all find out about what you really think.
C'mon, don't be so coy. Forget about the market for a moment. Let's blue sky this.
What would *you*, itod, the real living and breathing human being, who has bills to pay,
honestly, pay for a ghash on cex.io right now? If you saw the market price was 0.25
BTC/ghash right now would you get your wallet out and start buying? How about 0.15
BTC/ghash? Or 0.1
BTC/ghash? C'mon, you're not that stupid that you don't know what a ghash is really worth, even approximately.
If you expect others to part with their hard earned
BTC, what would get you to part with yours? I've told you my buy price. What's yours?
If you want to give me another of your "whatever the market thinks" answers, OK. There's no point in arguing further with you, Mr. Shill. But to others who have read this far, *caveat emptor*.