Yes 100% agree with you. If you want to make some immediate profit than better sell some bitcoins and purchase again when it falls. In this way you would have made some profit and also you will get bitcoin at lower price.
Most of the elite in bitcoin are doing this, but there are some that are very unruly with it and selling out of their fear, and they would sell every drop of bitcoin in their wallet, and right now that August 1 is coming I think that unruly ones would still done this thing and sell all their bitcoin before the impending split, well at first I am thinking the same thing to do before the split will occur, but I think I would just sell a small amount and will hold on to a bigger portion of my bitcoin.