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I will not just talk about the range of 10-60k if I talk about general trading then I think the main reason of selling is we failed to controll our emotions. On the others hand you have to know that trading is all about to buy and sell . Here we take a strategy for selling in this case you can think it panic or bad things. Because this is also one type of trading strategy.
I am agree with you and I also add one thing with it and that is needs for livings. Because not everyone has such a huge amount of money lying idle, money is constantly needed for the needs in life. So I think that is also a big reason behind the selling.