i have seen people use difficulty divided by 25000 as a way to estimate a non-market value for btc. currently, that would make each btc worth about $55. i think i will hold onto mine for the time being.
That's a ridiculous valuation, probably pulled out of his ass from nowhere. At $55, you would get 100% ROI in a month, that sounds like a HYIP scam, not a real investment. Even the current $15 valuation is pretty high, miners can pay off their rigs in less than 4 month if difficulty stay at the current level (which it might, since we haven't seen a lot of growth in computing power lately)