I don't think the goal of bitcoin is to provide sustainable income to people with high-end video cards.
Truth.
It is most certainly a pyramid scheme. The first ones in are rewarded with many orders of magnitude more coins than latecomers (say, people arriving 2-3 months later, never mind a year and some later).
You are an investment minded person much like myself. I happen to be in foreign currency exchange, so this BTC stuff hits close to home for me.
I had my initial gut-reactions as well, and they were similar to the viewpoints you have expressed here in your posts.
What I have come to realize is that this is no more a pyramid scheme than is an IPO and the rush of open-market trading thereafter.
You've got the guys who are "in" pre-IPO. They are sitting on a buttload of BTC's watching their virtual wealth go up and down on a daily basis.
And you got all the other people who are jumping into the game like mad, both as speculators (day-traders) and as miners.
What happened to GOOG after the post-IPO hype and bubble? Or any other stock for that matter? It doesn't implode, well sometimes they do but you get my point. Eventually they all reach some degree of stable sideways (range-bound) trading.
BTC will end up there as well. What is amazing to me is not that folks line up to mine bitcoins, but that the price stays "up" instead of collapsing in the face of an ever increasing float. Everyday there are more bitcoins available in the float than there were the day before.
When a stock undergoes a split and the float increases, usually the stock price takes a commensurate decline in valuation. Not so with BTC's, or at least it doesn't appear to be a first-order effect. That is what surprises me. Sure more and more people have bitcoins and they want to sell them, but there are an equal number of buyer pressure out there that keeps soaking up the increasing money supply.
We could call it a pyramid scheme, but it is no more a pyramid scheme than any other IPO of an asset-free .com tech company that only has/had value because at the time of their IPO they had an investment bank telling wallstreet that it (facebook anyone?) was worth billions just "because".