First I must say I never read the Harry Potter books and maybe the answer lays there, but it always bothered me that the liquid luck is so powerfull and yet rarely used. Why isn't everyone using it since it is so powerful and anyone that would use it would have a great advantage in a fight, a debate or anything really?
Even if it is really hard to create the benefits seems likely to be greater than the time and effort to make some.
I tried to look for an answer but didn't stumble onto one that satisfied my curiosity. Nonetheless I am open to redirection to articles/blogs I could have missed.