Patience is the key here, but people usually don't have it. We will see a lot of sellers right after next dip
I think selling is individual action and you can't blame people for selling what they have invested in. If I had the chance to buy Bitcoin when it was around $15k during the exchange wars and FUD, I will happily sell my bags here because with this rally and recovery, I should have gain a healthy profits here. Even if I don't sell all, I will sell 70% here due to the nature of Bitcoin collapsed and volatility. Don't be shock if Bitcoin moves from here to $80k and then it reverse back to $35k in 2 years later, it's very possible and I don't see anything wrong in selling your investment.
Some people will hold Bitcoin go up to a certain level but there greed will not give them right decision to sell and they will watch bitcoin collapse when bad thing happened until it reach or go below the price where they bought. I see that as waste of time in investment when you can sell and buy later.
You are right mate, we bought our bitcoin to make profit, and we can sell whenever we see a good amount of profit. Holding it long will give you a compound value, compare to when you sell and buy back like what you said. This is where patience comes into play, because you might think that you gave made profit, that you will sell off, and buy back, as easy as that.
What if you sell and bitcoin price keep on pumping and when there was a correction, it just didn't go below the price that you sold. It is a very risky decision, and bitcoin is worth hodling and sell in the bull market. Anyone that sells now due to he has made profit, will regret when bitcoin price hits the new ATH.