I think you have a small minded view on WWE's audience. One fan alone spent 17k on auction stuff http://www.reddit.com/r/SquaredCircle/comments/2abirk/an_observation_on_wwe_auction_madness/

WWE programming reaches 15-20 million people a week.
http://variety.com/2013/tv/news/wwe-reaches-record-20-million-viewers-in-a-single-week-1200576453/
Week in and week out of programming and plenty of cash being spent on special front row and PPV packages. Adults are spending a ton of money on themselves and their children. To say that wrestling is just for poor people is silly. Before they launched the internet network, you would have to spend around $600-700 a year for all the PPV and if you went to the shows in the area then your cost was easily over 1k. The diehard fan base has money, I can't think of a game Stern has released that has this big of a weekly consuming fan base. Everyone has a memory of wrestling and kids love it, it's a sure money maker for Stern. The only other license that would be bigger is NFL.

Also with hours of weekly programming I guarantee it they will be the most heavily promoted pinball machine of all time. If it is one thing WWE does well it's self promotion. I have no doubt you won't have the George W. Bush voice acting like The Walking Dead game, WWE puts a lot of effort into the brand.

It's hard for the pinball community to do, but it's not 1988 anymore. They've been promoting wrestling as a scripted TV show instead of "real" sport for almost 30 years now. No one who is a fan of the product believes it's real, even the kids who watch it. It's a TV show, that has been in the top 5 for ratings for the 20+ years. A new brainer hit for Stern just on the name alone.