To be honest I do believe in it depending upon the situation. I mean I know that I am not a good trader but if sometimes I win big then I do call it my good luck and nothing else. haha. So surely if that is my thought on my winnings then surely I do believe in it.
Luck many times is internal biochemistry for most of the people here and it changes according to situation to be frank. Many times we blame our luck when something goes wrong and many times we do the opposite in vice versa situation. So whether there is anything like luck or not but we do have its moral support somehow.