@Emilia42 I didn't mean that just because a guest agrees to the price that they should consider value to be 5*s. They could find that the host uses worn sheets, that the dishware is chipped, there is little in the way of kitchen utensils, and old scratched up teflon pans. There's all sorts of things that could legitimately make the guest feel the place is seriously overpriced for its condition.
But usually those places have photo galleries that are misrepresentative, and the reviews reflect it- guests saying things like the photos must have been taken years ago, as the place is quite rundown in comparison.
But if a guest chooses a place that is quite inexpensive relative to other offerings in the area, and is not presented in the listing as anything fancy, but quite basic, would it be fair for them to mark down the value because the bedding is worn and the dishes are chipped?
Value just seems like such an incredibly subjective thing that it's pretty useless as a rating. For starters, guests have no idea how much the host's utility bills are, or any other expenses that go into running an Airbnb. If they are from another part of the world, they might assume the expenses are far less than they are.
My electric bills average about the equivalent of $6US/month here in Mexico. If I brought that perception of the cost of electricity to the US or Europe, it could lead me to assume places are way overpriced.