> It's one share, one vote.
This is just wrong. As kmeisthax mentioned, shares can have different voting weights - if any at all. Many shareholders have no voting power.
> I employed a painter a few months ago, and I decided what colour the kitchen now is.
Did you actually employ them, or did you buy a specific service?
Indeed, shares can have different voting weights. And that matters, if you care mostly about the corner cases.