I like to disagree with that, using MLB as an example.
I am a heavy parlay player. Lets say you have a team like NYY with CC on the mound getting -240 at home etc. I'm not gonna lay the -240 juice but rather parlay it with a baseball pick of mine.
Do you understand where I'm coming from?
Many suckers use parlays, but if you play em in 2 teamers in MLB, you can make a profit.