i feel for you.
The greater the number of guests, the greater the probability that you are going to get lower metrics.
People don't really understand the star system, and unless you tell them, they will not always award a ear splitting, fly me to the moon 5 star when they've stayed at your home several times, or are comparing you with the Bellagio.
It also forces us as hosts to scrutinize every potential guest for the probability that they will assign us with a 5 star review. There is a cute little extension on Chrome that shows you what their comments were about other hosts. if they don't review, or are picky, or make less than favorable comments, we're going to turn them down. I've dodged a few hundred bullets that way.
The question you have to ask yourself is, at the end of it all, will it result in superior service? Or is it just a numbers game played by savvy hosts who consistently rebook the guests who give them high metrics?