Regarding the star ratings:

I read the page about the rating system, but I still don’t quite understand how it works, so I’d appreciate some clarification. It says that the scores from the date feedback surveys are accumulated, and that women receive an incentive gift of ¥5,000–¥30,000. ① What determines the amount of the incentive within that ¥5,000–¥30,000 range? ② It says the survey scores are accumulated—does that mean the average score? I apologize if this has already been asked or explained somewhere, but I’d appreciate any information.