Some writers have to do it in order to keep a roof over their heads. It beats getting a real job, of course. But you have to be careful that paying the rent doesn’t influence what you write.
Philip K. Dick (born Dec. 16, 1928) wrote to put food on the table but never just for dollars or fame. In a letter to fellow pulp author Jim McKimmey, Dick opined:
My main reason for writing is basically simple. I want to react against society; I’m after impact, not money.