Vanity is not a socially commendable trait, and only bootlickers admire the vain. Humility is admirable, and generates organic support. The two are of opposite affect on society, and the latter is beneficial, which is why it generates organic support, while self voting provably draws ire and disapproval.

You're fooling yourself if you think your opinion of your work isn't biased. Remember who the devs are working for when you consider code and tick boxes: ninjaminers.