Judging by the statistics of the survey forum members believe that all the same slots are more profitable compared to other gambling games. I wonder why OP did not add a lottery option to the poll?
I think this is because many individual here are slots gamblers that's why they're choosing slots over other type of games. The OP didn't include many games probably because he doesn't consider them to be pure gambling. Lottery is more like a fun activity because individual compete against each other without the house been involved but when it's other type of games, we'll be competing against the house and that's when it'll be in their interest to win us and winning become difficult.
Lottery usually has one winner so the chances of others winning is reduced but with other casino games, multiple individual can win big win together. Also in sport betting which many individual don't consider them to be real gambling, multiple players can win big and I think that's the game that give big win when you wager big amount.