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I saw here, how high-ranking members would be the first to get included in the best signature campaigns. I would feel frustrated as a newbie as I felt irrelevant and ignored as my rank was not that good so was my reputation.
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If you look at how campaign rules work, Those at the top don't always get a spot or get a piece of the signature campaign.
This depends on how one can develop and not be too monotonous on the account used.
Managers take into account how well and useful you are at creating posts and earning Merit in the last 120 days,
which is a mandatory criterion that needs to be considered.
I myself follow a lot of signature campaigns from several different managers and I see how @Hhampuz updates the Campaign Members,
he manages to make room for others who are more deserving and replace those who can't thrive and just do Habit Posts without any effect.
Going back to the topic of what the purpose of ranking up is, at first it was just a challenge that I needed to go through and had to reach the highest Rank.
But when that was achieved, it wasn't the end, and the High Rank had a lot of responsibility to keep evolving.
There are many accounts with high Rank, but in the end they are not used and are unproductive because there is no useful activity on the forum.