The stills are (still, heh) only getting 200 favour and their price went up to 2100. It looks to me as though the favour amounts (and encyclopedia/info entries) just need updating to reflect the price increases. Or did I miss a memo about donation value not being tied to vendor price anymore (as Millie says)?
Both vendor prices and donation value are determined from the "base cost" listed in the Encyclopedia, which stays constant. Different vendors have different prices, so the donation value can't really be based on vendor value.