[krainboltgreene]

    I have a serious question: why do people 
    get upset at bubbles? 

Because bubbles are unsustainable. Almost anyone who gets into a bubble, even at the beginning, will end up losing in the end.

But more importantly, a bubble doesn't keep going. It eventually pops and then the entire industry suffers. Why would you want the industry to suffer? You make money in it, I assume.

[kovar]

It isn't just the industry, it is the entire economy that suffers. The rush of funds to the industry drives demands for service industries and their jobs, among other things. When the bubble bursts, the industry certainly takes a hit, but so does everything that built up to support the industry.

Think outside the bubble.