They're not worth less to me. New Zealand is a tiny country with a tiny population relative to China. If the world government was decided per capita, New Zealand would have no say in the election. The world government would be decided according to Chinese values. That's not balanced. It doesn't mean I'm racist, if that's what you're implying. To the contrary, I believe New Zealanders and Chinese people deserve to have some influence over this hypothetical world government... in the same way that Wyoming deserves to have a voice in the federal US election.
With all due respect, you're not thinking this through clearly. I don't believe you really think two countries should decide the world government. That makes no sense. The world government analogy perfectly exemplifies why the electoral college system makes sense as a safeguard against highly populous US states. If you fail to understand that, there's not much else I can say to convince you. I can't explain it to you any clearer.
(I guess you also think the UN should be run on a per capita basis?)