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It's too bad to hear about the people who buy in and then sell a few days later.

Well, I suppose that it's normal to see that kind of thing... It is a pity for people doing it as you can't recognize if something is good or bad in 2-3 days... and delegating, staking, buying/selling, etc. costs you much more time and money than "testing the project"...
Unfortunately, people who just jump from one shiny thing to another will never find the "right one"... as it's always something new that shines better...