They look at the their recent activity and how many pictures and videos they posted.
From what I've heard, the word on the street is, that Sav Rose is very engaged with their subscribers.
As soon as I entered the room, I messaged Rikako the room number.
At the corner of my eye, I could see that the very nice room 601 was available.
In my humble opinion, I'm not sure, I haven't seen enough data, yet.
I will make her earn her money, but then Japanese mongers do that too.