The strategy is held over the weekend because it benefits from theta decay. As my profits continue to grow (and I get a bigger cushion of gains) I will keep scaling up until my full account size is reflected. This week is my biggest size yet.
I tend to believe what I am seeing is a temporary abnormality that will eventually disappear. Hence the reason I want to try and capture as much of it as I can before its gone. Before setting up the trade, I can "tell" if the edge is gone for that week or not. So, I should not get caught blindsided one day. Thats not to say there wont be any losing weeks though, there are a few places prices can end up which would result in losses. Not many places though.