You sell for profits and if you want to buy back, buy it.
And when you're selling and don't have any intention of buying back then just sell your position for a few of it but don't ever sell all that you've got.
If you are not well on making decisions then that would surely cost you but if not then you would really be finding this to be profitable.
So its up on someones decisions on when and how they would be selling their assets as long it is on profits then that what matter most.