For me that's not entirely correct.
You should be the first in the crowd to do things. Smart money.
You should get in first. Let the crowd follow you to make the market move in your direction, and when you get out you need the crowd again to follow you and push the market in your direction again.
You should not go against the crowd, you should frontrun the crowd. The crowd will move the market, not you. You should just time the reversal right.
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This only makes sense if you are the one moving the market, something that takes millions to accomplish. You time reversals that way you are just buying or selling at a level without knowing how that level is going to behave. It's trading based on wishful thinking rather on what the market is doing. Also the crowd doesn't move the markets, money does. You can have thousands of people buying if all they have is 2k accounts, it takes only one big fish to sell and make them all puke.

