You have probaly heard stories of people hitting massive parlys. While they are possible to hit there is something you need to keep in mind. Most parlays lose. Before you start making 10 20 and 30 team parlays lets take a look at what is happening.
https://degenbet.com/parlay-and-accumlators/
I would say parlay will make you REKT. You already know that it is difficult to win a single bet in gambling and if your win is dependent upon the multiple wins, this is more unlikely to happen.
People sometimes play parlay because the winning percentage in parlay is more as compare to single betting.