dude, don't try parlays,to win a parlay is very very difficult, cause there are always unexpected things happen, that's why there is sportsbook you know, if the results are easily to be bet, casinos lose money in the long term, not us, so casinos are not idiots. try to bet single bets rather than parlays.
Some people likes to bet on parlays because the odds is much higher than every single bets combined. Some people actually won alot by making parlays of huge odds consisted, not everyone though just some people but still it is worth taking a risk if you are only going for a small amount rather than trying to bet on big instantly