when the rates of btc fall down rapidly in weekly then i will buy and then sell .
in this way with small small earning i can earn more and more .
when rate will be around 100-200$ then i will buy some btc.
I think the price of bitcoin in the $ 100 price is not necessarily a cheap price could be holding it back. so I think you must be smart in choosing the price. not necessarily the prices down is a low price