Not every time because luck it by chance you get something which you have not expected and may even get unknown things to you. The way you invest is the big point of your investment not every time not the luck,

Share market is not on luck because shares you buy often goes down is not because of your bad luck the way you have invested and the profit you want to generate matters a lots on investment a big amount on any thing. If luck is always support us then we might not see any poor people in this world all where rich this is because we always play the same game of shares and sometime it happens. The meaning of luck means you were doing this first time and you won the huge price is because of your luck.