What you're ignoring is that there may well be other large stakeholders would vote for it if one or both of us didn't.
I can tell you for sure that I don't bother to vote for some proposals even if I support them for the simple reason that I see they're already approved and they don't need my vote. If they started to drop down too much on the list, I'd vote for them.
Anyway, the point I'm making is that voting is dynamic and you can't look at static votes as telling the conclusive "reason" why it is or isn't approved.