No one knows the "bottom" anyway. Someone will always buy at a point where it is low enough for them but a few days later the price can go down again and that person might regret buying even though the price them bought at was already quite low. There will always be a lower bottom because bitcoin is volatile and almost close to being unpredictable. So I agree that there is no fixed perfect entry point. It always differs person to person. The rule should be is once it is low enough for you then you should buy already.