I am of the opinion that you need to buy some coins and keep them until you reach a certain goal, then sell them. This is not necessary to do with bitcoin, you can also use altcoins.
I guess everyone already into that kind of things but I'm not sure what you are actually referring to.
Everyone here is buying bitcoin or some other altcoins and definitely will plan for long-term holding with some target and will obviously make profits as well. But, OP is trying something reciprocal; they sold bitcoins and waiting for bitcoin market to crash so that they will buy back for cheaper. This way they will simply multiply their number of bitcoins.
Personally I'm not having any idea to short my bitcoins because I am afraid of missing out another round of bull run if I short bitcoins now or at the end of this year or any time. Just want to make sure that I will be having some bitcoin to cover any possible bull runs.