I play the piano for a variety of reasons, both good and, well bad.
These are ranked, but not too accurately.
1. The piano is a wonderful instrument. It can share moods, feelings with other people and it is adaptable to many types of music. ( Piano is used in classical, baroque, jazz, etc. ) Correct me if I'm wrong. The sound of a key from a piano is useless, but if you put together the right notes, you can do some serious wonders. I still ponder how sounds give us feelings, but that is out of the scope for this post.
2. I really like music. Especially classical. And boy, isn't piano the perfect suitable instrument for that practical disposition!
3. I wish to compose music, even a little. No matter if it stinks at first, that's how we all begin, don't we? Piano and music theory, I suppose would go great together.
4. Being called a pianist, you can get a little pride, some joy in having such a honorable title. Even as a amateur.. I'm.. getting there.
5. Being a middle-aged teen in his adolescence stage or whatever 'ya call it - puberty?- I think I can catch some girls off their feet with the piano. I can pull off a really mean C Major Chord. [who am I kidding?

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