this is only strategy i already know Buy low and sell high, but the problem is that it is easy to see the good entry and exit points that have been, it is difficult to see the ones that will come in the future.
so how about DAO case ? the last day price high is 26.000 stoshi and the lower rate only 23k satoshi but the price falling to 7.000 sathosi and now stable at 13.000satoshi,
if you buy at low price (23.000satoshi) now you loss moremoney.
sometimes you must change your rules like sell low and buy back at lowest price.