I don't agree with voting up your own comments.
As in, "What a Wonderful Post" and I'll have the 100% 2 cents or $100 for that fantastic contribution to the Steemit Community. Thank you very much.
It's not only acting the Nob, it's also unethical.
If you want to enrich yourself with Steemit mining.
Write a great Post. (Like this one) Then up vote it.

But let the comment up vote, be someone, who actually likes the comment.
And go and use your selfie up vote on someone that deserves it