it creates a huge incentive to vote for posts that are already the most popular.
With linear curation rewards plus linear content rewards, it's no incentive to vote for popular contents, nor disincentives though. You get same return no matter vote for what, the only factor is downvotes cast by others. Some people will downvote "overvalued" popular contents, so a better return is not guaranteed.
RE: Benefits of Pure Linear Reward Distribution