I still don't get why Vegeta isn't King of the Saiyans. His father was King, so clearly King is the title for the ruler of the Saiyans, why didn't Vegeta inherit it when his father died? Yeah, there's not much of a kingdom to speak of, but if you're going to insist you're the Prince, why not insist you're the King?
Technically, Bulma would be a princess consort. But it was never given serious attention or formally acknowledged, at least not until GT when Bulma makes a comment to Vegeta and then Chi-Chi about her being his princess. When that happened I was like "Bulma, grow up already." Know what I mean? LOL