I have used a similar system in the past and it's is a whole lot of fun. But that's all.

I used to play the dozen groups. Bet on middle and the higher one. When I was "confident" (drunk) I used to also bet on the rows at the same time. Great when it pays off and as you said, you get a free feed, free drink and a free ride home.

Keep going, it's just for fun, not a long term "job".