Because its a stakeweighted system where a vote depending on the amount of SP they hold is worth more. On Reddit for instance it doesn't matter how much comment or link karma you have, 1 vote is still 1 vote. This leaves abuse to botvoting posts onto the top of trending or hot even if the content is garbage because someone has bought those votes. Here bigger users can remove some attention and rewards from the posts if they so see fit, while sacrificing curation rewards in the meantime.
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Well, actually I wrote a post today on this topic, you might check it out and comment what you think. Generally speaking, I think that ranking algorithm should be more sophisticated and depend on many facts.
https://steemit.com/steemit/@hoodaim/conflict-of-interests-upvotes-vs-flagging-is-there-a-solution