Ha ha, yep. The parks are full of shops and restaurants that expect you to pay in addition to the admission price.
I know that is not the same thing, but if you think about it the carnival games are that much different than the included attractions as well.
Don't forget that theme parks started as you pay for a ticket for each attraction (for example an E ticket), then there was the business decision to do away with that. I do not see it coming back because people spend more time and money in the gift shops and eating.
If you think about it you should encourage others to play the games, because the more people spending money there at least helps them slow the skyrocketing ticket prices.