Fame
Tell yourself you didn't go into physical therapy for fame. Fortune, maybe, but probably not fame. If you believe in the "all things are possible" mode of living, you might become famous if you: found a wildly successful PT chain, make millions and appear on the cover of Forbes magazine; if you cure Oprah of sciatica and she gives you your own TV show; or if you become the PT version of Dr. Phil and rule the world of podcasts and radio waves.
Note: It's always PT-plus-something-else if you're chasing fame. PTs typically won't become famous for doing only PT. But what's wrong with doing good work in relative anonymity? Thanks to you, fewer people will be in pain.