As long as BTC keeps going down relative to fiat, then you need to spend BTC the instant you get it.
you don't have to spend the BTC. you can also "lock" the price (hedging) with futures
Sure, if you want all your
BTC to be stolen because you sent it to a private key not under your exclusive control.
actualy, you only need to send 1/10 (in case of okcoin) because of 10x leverage (796 has even 20x). but i get your point.