The key question isn't "What fosters creativity?" But why in God's name isn't everyone creative? Where was the human potential lost? How was it crippled? I think therefore a good question might not be why do people create? But why do people not create or innovate? We have got to abandon that sense of amazement in the face of creativity, as if it were a miracle that anybody created anything.
Abraham H. Maslow, Deborah C. Stephens (2000). “The Maslow Business Reader”, p.185, John Wiley & Sons