Going to try to post a few more supporting links here:

Witness #8 OKs self-voting:

https://steemit.com/steem/@clayop/no-more-fear-on-self-voting

"Overcoming Fear on Self-voting
But is it really bad, especially in linear-based system? Assuming everyone is doing self-voting, a person who is holding 10% Steem Power will earn approximately 10% of contents rewards. If one is holding 1%, he/she will get 1%, and 50% will get 50%. It is literally selfish, but a self-voter doesn't over-use his/her power more than one owns."

These are good, economic justifications here. Don't feel like looking up more atm.