How much is too much? What self-vote % do you consider to be abuse?

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Because on Steem we have the ability to upvote our own content, doors are wide open for users to abuse the system in order to maximize returns on their SP. While some might not agree with the fact that rampant self-voting is abusive behavior, I think that most will actually agree that it is.
But exactly what percentage of self-voting would you consider to be abusive behavior?
Let us know.
- 20-30%
- 30-40%
- 40-50%
- 50-60%
- 60-70%
- 70-80%
- 80-90%
- 90-100%
- self-votes aren't abuse!
Answer the question at dpoll.xyz.