First, I don't see or consider gambling a good or reliable source of income and I don't support anyone who says or think otherwise because everyone has a choice they have made to live on. I was considering gambling and sports betting a good short cut to make quick money and become rich but after the experience I have got over the year, I don't even advise anyone to go with such belief.
Also, in gambling or betting, winning is not usually 100% guarantee but there could be a high chance to win a game which doesn't also mean that the game can be successful, but it's not a must to gamble all the time or bet on games that you know there the chance of losing your bet is very high.