I can't say if it's a big business but in 2011 home coloring in the US hit $1.9 billion!
Me too!  I always made such a mess!  Interestingly, there were  $1.9 billion in sales of at home coloring in the U.S. 2011!
I like to color my hair to cover gray, do you color your hair? No hair to color actually. Do you get yours done? If so, is it done at home or do you go get it done professionally by a hairdresser? I'm leaning towards going to a hairdresser, I've made quite a few mistakes doing it on my own. But I've seen so many people buy products, it must be a big business right?
At home coloring in the United States reached $1.9 billion in 2011 and is expected to raise to $2.2 billion by 2016.