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30% would get you 0.6125
33.4% would give you 0.5501
the estimated price which you said was 0.61 forgets to take in to consideration that asicminer has 4 million usd worth of funds. Some of which can be put in to next gen hardware that will most likely be more efficient than anything else considering all the costs.
That's just based on last divs and 30% APR, it's not an "exact" valuation (which is more voodoo than exact anyway).
If you mean that the price is undervalued, I totally agree.