Why are you constantly keeping bitcoins in these exchanges? If you had dollars locked up there, I could understand. i.e. you were in the process of purchasing b

Why are you constantly keeping bitcoins in these exchanges? If you had dollars locked up there, I could understand. i.e. you were in the process of purchasing bitcoins. But to repeatedly have your bitcoins locked up when you could have almost instantly transferred them to your own wallet at any time seems odd.