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I disagree because curation rewards can be worth several times what a self-upvote is worth.

Why not let people who want to patronize others do that, let people who want to self-promote do that (but with a lot less spam), and let investors who do not want to participate in the social media aspect do that without suffering inflation penalties?

I detail more of my thought in this post.

https://steemit.com/steem-ideas/@donaldtrumpfan/allow-a-100-sp-vote-the-best-voting-problem-solution

Also, look at the current content. It is already 90% self-promoted trash. For the rare contribution that is worth up-voting, I would rather give much more than 2%.