Why wasn't Luke ever called Prince Luke?

I'm sure we all saw Star Wars. Princess Leia's twin brother was Luke. We agree on that. So why wasn't Luke ever called Prince Luke? If Leia was a Princess, Luke ought to be a Prince.
I thought of that last night, while going to sleep. It was a "Yeah, how come?" moment.:)
 

Also, Stars Wars events took place a long time ago in a galaxy far, far away where different rules applied. For example, the mother of the twins, Queen Amadala, was an elected queen not an heredity one.
 

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