There will always have to be some discretion involved in the definition of abuse. Votes are subjective proof of work, and the abuse of votes is also subjective. An objective definition will always have some corner cases that allow things that are abusive in spirit and disallow things that are not abusive in spirit.
I very much appreciate that you guys are taking responsibility for your large voting power though. For me it is all about responsibility, even when a vote is sold (I delegate my SP out for a price, but I try to do that responsibly as well).
Definitely. It will always have corner cases and discussion.
We can only say: If your content is really good then you will most likely not have a problem. And if your content is on the edge of being good, then maybe you can improve?
We listen to all feedback and want to include the community in this :)