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But I absolutely agree that PM's and Bitcoin complement each other very well. I'd certainly recommend holding both. The main disadvantage I see with Bitcoin is the possibility that it "breaks." But if it doesn't, I think in the long-term it will steal a lot of market share from PM's. Of course, if and when that happens, your BTC purchasing power will be up so dramatically, you probably won't be too concerned about whatever hit you've taken in PM's.
I would love it if Bitcoin stole even the tinyest barely noticeable amount of 'market share' from PM's. Among the reasons, it would make me insanely wealthy personally. That is a part of the reason I speculate in it.
Another reason I prefer Bitcoin is that gold is very difficult to shake out of the hands of those who hold it, and most of these are hands that I would love to see working in the poor house. With Bitcoin, OTOH, if a significant fraction of the user-base were at a significant enough disadvantage complements of the owners of the currency base, they could simply upgrade their software and switch to a more promising solution. So there is pressure on the
holders of the currency to ensure that it is relatively useable and useful to the general population.