This is totally insane. $21,000? For Preschool? What will that overpriced program do that your neighborhood preschool wont do? I'm willing to hedge a million dollars that it's very little.
QUALITY preschool hinges on two main things: (1) how involved the parents are and (2) how positive, nurturing, and formally trained the caregivers are. That's it. $21,000 might buy nicer toys, a nicer building, and a nicer neighborhood, but toys, buildings, and neighborhoods do not care for children.
Please...do not buy into this "building a super kid" mentality. A kid will be who he will be. Just love them and spend as much time responding to them postively as you can. That's it.