It seems that’s partially taken into account:

New analysis of 99,206 Steam games illustrates just how extreme the economics can be on Valve’s PC gaming emporium

Over 8,000 paid games analyzed never received a single Steam review

This report also only looks at premium games, meaning free-to-play giants like Valve’s Counter-Strike are left out, as are “non-game software, adult-only titles and unreleased entries.” The list of 99,206 was selected from a base of 136,281.

The only caveat is that revenue is estimated, so there can be big swings in the data.

The standard multiplier here is 35, so this research assumes one Steam review is worth 35 sales at a game’s current listed price, though you can also use a more “conservative” 20 or “generous” 50 in the report’s impressive graphs.