Just had a peek at HKG-KHH on dragon and I don't really understand the pricing. Economy is around £180 or 9000 avios so either is pretty reasonable. But Business is a whopping £880 or only 18000 avios. Why is the business cash fair so much for a 80 minute flight? Is it mainly used as a connection flight (which is what I normally use it for)?

I think when I did exAms-HKG and added KHH in biz it only added around £100 to the cost.