So given these assumptions, shouldn't we all be able to determine the value of each mining share (within an expected range) of different companies at any given time using a time-weighted first-order Taylor approximation based on mining power? At least it should be able to prove efficiency one way or another.
For pure mining assets, yes. What AM does to throw a wrench in it is to not do mining only and by operating in a country where costs are artificially low. These factors, however, only come into play in the long run; the first when we've seen some of the competitors come online and the latter when commoditization of ASIC mining has come a lot further than now.
However, factors come into play to make the profitability evaluation very complex here too. Right now, AM is leading the mining race _because_ they have and can build those Pentium IIIs and nobody else has anything of importance. However, we know that others are coming out with Pentium 4s, Xeons, Core 2 Duos, i7s and so on, and we know there are others setting up computation farms.
The big question is whether AM has the time, resources, and know-how to catch up; their current 20 TH/s is peanuts a few months down the line. Even the promised 200 TH/s isn't much.
friedcat himself has estimated on average 10% of the network speed, which correlates to ~฿10K/month on average. When they net ฿20K in one week and a bit right now, that actually represents 1/6 of what friedcat thinks they'll make
in a year.
Yes, those 20K includes hardware sales, which makes the situation somewhat interesting and throws in that wrench I mentioned. AM can adjust their income by shifting between mining and other operations, so if they are losing competitiveness on mining they can shift to hardware sales while they develop new technology, in a very simplified sense. This brings strength through flexibility to AM shares compared to pure mining shares or pure hardware shares. This flexibility would be like Intel both renting out computing power and selling cpus and could move from one focus area to another depending on where the highest profitability lies.
Thus, in order to properly evaluate the value of AM, you need to look at what yields the highest profit from mining and hardware sales because AM can ride both waves. I believe the recent price hike is a result of AM demonstrating that they are able to ride both waves, first by mining profitably and then by selling and delivery hardware profitably. Compare this to some mining bonds (no one in particular) who promises some kind of revenue sometime in the future and hardware manufacturers who promise some kind of hashrate sometime in the future.
AM has killed off a lot of the uncertainty and people reward that with a higher share price.
Of course, most people are barely able to wrap their head around evaluating mining profitability, so throwing hardware sales profitability into the mix leads to inevitable chaos. That uncertainty leads to prices fluctuating because when there is no relatively easy way to say a share's value is X then what drives the price is hype and expectations, founded or otherwise.
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