Congrats to this sports bettor. That is certainly an adequate ROI on $50.
The power of compounding.
It works for Bac and other even-chance(ish) games too.
My preference is to do four compounds(i.e., five hits four compounds).
https://www.casino.org/news/louisiana-sports-bettor-turns-50-into-574925-on-six-leg-parlay/ (https://www.casino.org/news/louisiana-sports-bettor-turns-50-into-574925-on-six-leg-parlay/)