Just a thought and probably a little off topic: If one wishes to use music as a means to support their financial well-being they will, more often than not, have to be a well rounded MUSICIAN. Not just a pianist. Being a well-rounded musician means that you should be able to read music, write charts, play multiple instruments and/or understand their roles, be a leader, submit to authority, teach music( vocals and your respective instrument), and yes, play in all 12 keys. This is just my point of view that is based on my observation of my peers. Most of my peers that support themselves financially from their musical talents are able to do all of the above. I only know of one guy, a bassist who supports himself by exclusively playing the bass. However, he does serve as a music director over his church band.