It's a good concept if you wish to have extra fun with friends while watching some games, I have done it many times... Usually with small money, each of us chooses a game or two for the parlay. We never won anything with those parlays, we were close so many times for one game or one goal on each side. That's why this is purely for fun, and we never risked a lot... we never gave more than $5 each. We had some wins only when we were betting on just one or two games max, but as I said it was with some small amounts... we had for a few beers and chips, and maybe some little money left for the next bets.