Just because you can see a bubble developing does not insure that you can make money on it. I did more or less double the money at risk. The bubble of the century and that was all I could do. But we did not cause it. It was foolish valuations.
Cost is different from value.
I notice that some stocks are still selling at 100s of times earnings. It does not take very sophisticated math to show you can never make money holding such stocks. So you must find a greater fool. Lots of luck. So when you wonder how I can afford to do this, much of it has been paid for through a contrarian view of the stock market.