BTC value is directly related to its velocity and the value of the goods and services that are transacted in BTC. I held the purchasing power of USD constant, simply to derive a value of BTC in 2013 dollars. If USD experiences a large shift in PP (unlikely), that would affect BTC/USD. But either way that's not an inherent source of value to BTC.

This is my last comment, as I cannot possibly respond to an endless string of unfounded criticisms.