There is nothing in place today that can stop "everybody" from self-voting.
And yet, strangely, it hasn't managed to kill the concept.
I fully understand that "determined self-voters" are difficult to stop.
I'm simply proposing a bare-minimum code patch that would prevent the noobs from voting on their own posts and comments in order to send a signal that self-voting is considered some sort of "cheat".
As it stands now, people are only "informed" when they notice their rep's been cut in half for no apparent reason.