I made a wheel like this in a popular free to play game.
Each section was equal in size but not in weight. We wanted to give the feeling that they could win big but not give so much currency that people would not spend on the currency.
It worked so we kept the wheel weighted.
Anon because making free to play games is admittedly kinda evil.
I'd love to see the grand parents' suggested made active. Hunting whales isn't about making fun games. It's about exploiting addictive behavior with a tiny set of people.
It's the same reason slot machines always "almost" hit the jackpot.
It's more addictive that way.