Yes, selling Bitcoin at a reasonable price is not a foolish decision. The stupid decision you can make with Bitcoin is that you can sell your Bitcoin for a low price or during a Bitcoin dump. Your sales can be one of the strategies to get fresh money to start a new trade so it really depends on how the user stands.
I think that this is quite right. If you sell your Bitcoin at a high and somehow reasonable price, then you could not consider it to be stupid. It might be such a waste if you lose your profit when its price is high.