This would produce the most gains , but if you predict wrong you could be stuck waiting for the price to either come back up or down to get back in. I did this the other day. I sold and bought back in at what I had predicted was going to be the next upswing. However some last second sellers swooped in and dropped the price below my limit. Then it just continued to fall from there. Now I sit and wait for the price to come back up to my purchase price so I can get back at it. I hate waiting. I get antsy. I should have left some money in reserve so I could have at least bought in at the bottom. I got greedy. Now I wait.