Champion Skill Rating is Stupid
I have observed this phenomenon frequently as a support main where you spend a lot of time roaming around the map making plays for your team, saving lives and getting picks, vision, etc. This often means that your gold and experience are somewhat lower than if you had just stayed in lane the whole time. This plus the tendency of supports to die for their ADC's survival when necessary mean that some of the best support play often results in score lines that are less that exceptional. I experience this frequently as a Braum main who regularly dies in the front of a team fight so that my back line can live without fear. I often feel like I am getting punished for good macro plays that win me games. I get that I don't play in the same style as most supports at me ELO (abount Silver IV), but that doesn't mean that I should get punished for making the team play and sacrificing my own gold and exp for the good of the team.