They're a bit soft or moist, aren't they (glycerin)?
My brother had the same idea and chopped them up & put them in a container.  Unfortunately, the chunks dry out after a while, and they're quite hard to start.  I had to start a small fire to start these firestarters, and that was in my wood stove.   <img src="/images/graemlins/frown.gif" alt="" />
Sue