I think steemit rewards should go 100 percent to the curator. ( the writer is the first curator). Then everyone is focused on voting for winners rather than themselves.
That said I think it's fair to vote for yourself as long as you also vote for others.
That's an interesting proposition @ender. I don't really have issues with occasional self-upvotes for quality content and even comments... the the abusive version that bothers me... when someone is using 90%+ of their daily voting power on themselves for two word comments... makes a mockery out of quality content creation.