It would suck to pay more based on bad or poorly understood data. Especially since I doubt they'll willingly give refunds if their foundational data is proven to be problematic.

Oh for sure. It's a carrot-type program though. So you don't get any penalties for not doing something, but you get rewards for doing things.

Discounting from higher default prices rather than penalizing from lower default prices is more of a branding difference than an economic difference:

https://news.ycombinator.com/item?id=47952034

Yeah but in South Africa medical aid rates are regulated by the government and all companies have to stick with that rate. The idea is that if you keep your customers healthy then there are fewer claims.