Billy: AFAIK, hair stops growing almost immediately after you die. However, as your skin starts to dry up, it shrivels away and your hair *looks* as if it was growing.

Two points:
1) Van Gogh sold more than just one painting, although he sold them at prices that are ridiculous by current standards. He also gave some away to pay bills, which is comparable to selling.
2) Brushing your hair is good for blood circulation and has a (minuscule) positive effect.