I think they want already to receive their income and they don't want to hold it because they want money. They work for it and they don't spend money to invest with so that they want to sell their rewards to have an income to their hardwork. They take the opportunity if the value of this coin is in high value and they don't want to take time to hold it more in the future. All of us has a main purpose in here so that you will never know what in their minds are.