Yeah, but I don't base my own actions on spot price, unless you are considering some kind of a raking that you might want to do. and surely, with something like raking, you can set various prices that you would like to make withdrawals, such as every time the BTC price goes up 30%, you withdraw up to 3% of your BTC holdings.. again that would presume that you have overly accumulated and you are not necessarily withdrawing to buy back but instead you are selling in order to rake off some profits - and yeah, 3% every 30% might start to add up to selling way more BTC than you would have had wished, unless you had already decided that you had reached a status of over accumulation of BTC.