It is an interesting dynamic and something I have personally struggled with, but lately I have gotten comfortable promoting myself when earned/applicable. (as in comment votes)
As for post votes, I have always has the upvote post box checked in my submit a post screen since day one so had not even thought about it.
Now that I do though, hell yeah I am voting myself up. Worked my butt off for 11 months to build up some SP never having a big pay day post or one viral or even sniff the trending page.
Plus, 90% of my posts are value add not fluff. I aim to provide value to the community. Hard work equals a good steak dinner from time to time, now I can afford to finally buy one. :-)