I think blackjack game is a good method to earn some bitcoins,but play only for short time and don't bet more than can't afford to lose.
There are some skills involved in the blackjack game. You need to master those skills and with some luck to win. Most of us cannot win.
Luck is not really effected, your skill is can decide your winning or not, this is what i like in blackjack game, you need learn and got an experience until you can be a master of blackjack.
Do you win blackjack in medium term? Have you mastered all the technologies in blackjack?