You know what else they want a lot though? Food. Especially the young ones, who can be like bottomless pits at times.
Kids want food they like, just like everybody else. Toys with happy meals are just an added perk. Frankly I half expect the next move to be banning fast food places from having playgrounds, deciding it also entices kids to eat unhealthy food.
Despite, y'know, the common sense that if they're going to eat that food, a place to exercise and play is EXACTLY what they need.