But the other reason is we haven't seen gold take leave of the fundamentals. The financial crisis that has been unfolding since 2008 has revealed that the only response governments seem willing to take is ever more monetary inflation. The more money out there, the higher the price of gold. Secondly, most gold trading is at the level of very sophisticated people, not the average joe. When average joes start piling in and blowing up the price, then gold may take leave of its fundamentals and we'll have a bubble.
The thing is, in bubbles, supply rushes in to meet demand-- but you cant' scale up supply of gold like you can dotcoms or houses. Environemntal regulations and kleptocratic governments keep new mine production opportunities limited.
Finally, mining companies-- which should be the darlings of the gold bubble if there is one-- are trading sympathetic with the rest of the stock market, not contrary to it. If we were in a gold bubble, then good news for gold (eg: bad financial news) would cause those prices to go up-- but they don't they go down now. This indicates that they are not seen as an alternative, but as being subject to the bad news the same way General Electric, et. al. are.
We won't enter a bubble phase until that has changed. When people start seeing gold as a safer asset (or as a bull market "you just gotta get into!") then we'll have entered a bubble. At that point, when there's bad news for General Electric, you'll see a bump in the price of GoldCorp. We saw this in the dotcom bubble-- a big IPO for a tech company would cause a decline in General Electric or Gold for that matter.
All of these are subjective observations, so neither of us can really prove the other wrong of course. I found it interesting is that we use the same signal to detect a bubble-- the hair dressers and MLM schemes. I'm impressed to see how much more popular gold is outside the USA than it is inside the USA. I take that as a sign that it is heading towards a bull market.
However, if you're right and I'm wrong, I will be very severely punished by the markets. I'm not too worried, though. I got punished by the dotcoms. I played the housing bubble successfully going up and going down and got out a bit early, but am happy with the result.
I remember being told I was crazy on forums because I said there was a bubble in housing. So, you're not crazy, I just think you're too early.