Why are maps made the way they are?

Today we started to talk about maps and we looked at the first maps made of the Earth. Towards the end of class though, I was very interested. We were talking about why North is on the top of the map. The only real answer is because it is always been that way and we are used to it. But, there is no scientific or geographic reason that maps or globes have to have North America in the top left corner and Australia in the bottom right corner. If we did not have maps, most people probably wouldn't know where they were on Earth top, bottom, or middle because Earth really doesn't have a top or bottom. North America is only on the top left of maps because that is where cartographers drew it, not because they knew that for sure. There is no reason why Australia couldn't be drawn on the top left corner. Not everyone sees the Earth from the same point or spot. I think maps were made like this because people are bias and want "the most important" continents and countries on the top and the not so important on the bottom. Think about it, usually the best person is at the top of the list, is on the top team, or the top class. The worst person is usually at the bottom of a list or ranking. I think someone should make a map with North America on the bottom right corner and Australia on the top left, because it would make no difference and it wouldn't be wrong.