Hello @Tapio0,
I agree that this is a flaw in the system. We should receive credit for long stays as well as frequent stays. My suggestion is to post this in the "host voice" section. This is a forum where people can make suggestions directly to the company. If enougth people comment or 'like" the idea, then it is automatically flagged for review by the company. My guess is that action might be rare, but I know that it has happened.
Another thought - after you post the idea to the host voice, post a link here. That way more people will know about the posting, and it might get more responses!
Good luck!
Hilary