What is with the ending of The Frog King, or Iron Heinrich

What is with the ending of The Frog King, or Iron Heinrich? I always thought that the frog prince was some variation of Beauty and the Beast. You know, she falls in love with the guy inside. She throws a tantrum and chucks the Frog at the wall. What kind of a moral is that. The middle works toward an essential value. The value being don't go back on your word or never forget a gift, or something along those lines. And then the twist comes in the end when we find out the Kings servant shows himself. He is this really great guy who is loyal and has great love for his master, but what kind of moral is that? Be good and loyal to your master. There is no real reward for the loyal servant, he's still a servant. I wonder if this is some subconscious meaning. You know, if the moral of the story is you should be a loyal servant just because. I'm not really sure where I was going with that; I was just curious what kids, or even adults are suppose to make of this story. I mean the main character is a spoiled little girl and in the end she gets her way. She has to endure a frog eating out of her plate, but other then that I would say she gets off pretty easy for being the worst character in the tale. While mentioning characters with low moral standards I have to mention the Frog King. I get that every one wants to marry a beautiful person, but haven't we been taught that beauty is on the inside. Not for pretty girls I guess. Actually I don't believe that because I know very beautiful girls who are also beautiful inside, but lately I wonder how much our society really places on looks. We say beauty is on the inside, but what this story, and what media shows us is quite a different tale. I'm sorry I'm rambling. It's just that my search for moral guidance within these tales seems to be falling short and I am again asking; are these stories merely for Stimulation of the imagination. (not that this would be entirely a bad thing)