So, don't sell to them instead, hold patiently and in matter of time depending on your goals and assets values, you could imitate them (whalers) or could even be one in the future.
Well if someone a retailer got a huge profits. Its normal that he sold it, nothing can change his mind for that. But that sold will lead to a new holder as someone will take his place. With bitcoin volume, I think it will not much truly go down considering how adoption happening therein. There will always be new players to take much pie of the bitcoin supply.