I work on a gamification product. We have schools as customers, they made a game that engaged the students and in an a/b testing showed much better results over time.

They pay 0.1% of what other, non-education customers pay. Because that's all they could spare and allow.

Needless to say, the servers alone cost more than what they pay. Not to talk about the massive amount of support they consume.

So if you wonder why it's not widespread - that's why.