Clarified in previous post. Original post seemed to be talking about all reviewers, on face of Earth, in perpetuity throughout universe, etc. etc… Your confusion is coming from your own perspective, which is definitely not unique, but also not universal.
There are absolutely audiences for outlets who focus on games for critique and analysis regardless of retail price. You yourself clearly belong to said audience. Outlets such as this very site and other critique/analysis publications serve this need.
There are also audiences of game-buying human beings who may be considerably more concerned about a game’s retail price, due to limited personal budget or whatever other reasons. To help them with their purchasing decisions, this other audience need some sense of value, at the very least, a relative one that puts a game’s offerings in some kind of context (“8-10 hour single-player only game in the vein of Bayonetta,” “brown military shooter with 4-6 hour campaign + lackluster multiplayer with a substandard number of maps,” “$60 MMO with $15 monthly subscription that isn’t as good as W.O.W.,” etc.).
Sadly, latter audience tends to outnumber former audience, which is why there are more GameReviewsForAllGamesOnAllPlatformsOutOf10.com-like publications than there are of the former…which is just a function of supply/demand.