The commonality is obviously stupidity but besides that, the real monitary cost is hard to measure.
Sure you can look at whatever your investment was and write it off versus gains in another year but its more than that, its what we call opportunity cost which is simply the next best alternative.
For example, say you sank $100,000 into one of the above investing disasters fifteen years ago. You would have missed out on fifteen years of growth at 'X%'. Assuming just a measily 2% would be $134,000 today. At 10%, you'd be missing $417,000 today, not just your original 100k.
So when looking at investments, keep the lost opportunity cost in mind.
Remember that successful investing has as much to do with not losing money as making money.
The trick is to identify a bubble and not participate because while the idea of a fast buck is appealing, the downside is worse.
Remember the secret to making money in any market is not to lose money, your gains will come over time but losing is hard to overcome.
If I double my money this year and give back 50% nest year, I didn't get anywhere, took on alot of risk and all for nothing and likely missed out on a real opportunity (we call that opportunity cost).
Most bubbles take on the form of the chart you see here when normal assets take on a life of their own and become something you must own ONLY because it has to go higher, right? wrong!
If you stick to a boring old investment strategy of adding to an index fund on a regular basis and putting any extra cash into paying down the mortgage (aside from six months of cash for emergencies) then you are likely to avoid all bubbles simply because you are disciplined and don't have silly cash around to participate. Good for you.
As an aside, I am not a prognosticator but I am willing to say that gold is in the bear rally part of the chart there and has already seen its best days.