I think we need both luck and skills.
why?
You know trading is the best way of earning big amount of bitcoin.But a newbie or anyone who don't know about trading can't become succeed on it.So, every trader needs to have proper skills too become successful.And as like gambling trading also depends on luck but not much.Skills are also very important, so we need both.
Even if they have both luck and skill doesn't mean they can't lose. They still can lose but the different between newbie and experience trader is consistency for achieving prefereed profit ! If they stop, they already accept the fate but if they keep continue trading , they can success as millionaire