Look at the people self-voting close to 100%, do you think that behavior is beneficial to you, themselves, me and others?
I don't know. It depends on the content. A content creator who produces useful content and upvotes it, but does not spend time reading others' content or generally curating is still a valuable contributor despite 100% self-voting. A spammer who self-upvotes and also votes on others (or perhaps a pair of spammers who vote on each others' spam but not their own) is still an abusive spammer. The statistics in your post by themselves are useless, as is the implication that 'self-voting' or a high self-voting percentage is inherently harmful or evidence of abuse. Neither is correct.
If they were useless there wouldn't be dozens of people upvoting, commenting, resteeming and so on.
I know what you're saying that not 100% of the cases would be abuse unconditionally, but you know as well as i do that your example is extremely unlikely. And again, it's just a datadump. People can do whatever they want with it.
Heat does not imply light.
Right, but people also say there's no bad publicity, right? ;)
It depends on the content is somewhat of a cop out argument. Don't you think? From a reasonable standpoint, given the present volume of comments and any other factor you would like to include, how much do you think a really fantastic, i mean really fantastic comment should get?