100 points isnt much difference in skill at clublevel but its a huge skilldifference between for example Carlsen and Gelfand which is 100 points. The higher the rating the more they matter
Actually, the reality is far more complex and nuanced than that. Jeff Sonas actually researched this question a few years ago: Review of the FIDE rating system
Amongst other things he found that the expected scores used by FIDE to calculate Elo ratings are not achieved consistently. Players rated over 2200 tended to come quite close to predictions but lower rated players diverged significantly from the "expected" results. They scored better than predicted against players rated lower than themselves, but worse than predicted against players rated higher.
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