BTC On The Rise More Buying ?

I have seen it countless times btc starts going up and huge amounts of people start buying more. But, when BTC starts dropping people start selling.
Buy high sell low seems to be the most common thing to do in the Cypto market. But, why ? I have seen a simplar patten in the stock market and can not understand why this patten continues to repeat time and time again.

I have been holding btc since 2017 and will sell the lot someday.
My favourite two faucets.
2. Many pre btc earning sites use to be Dutch and this is a grear faucet.