Bill, while you can satisfy yourself on the piano, the people that you really need to satisfy is the audience. I love playing a 12 string guitar and singing in a smoke-filled bar, but when I began playing the keyboard, the audiences loved me a lot more. I could do things that I could not do with just a single guitar and me, or a piano and me. The arranger keyboard provides you with the ability to fulfill the audience's needs. When they're happy, I was happy and performed better.
All the best,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)