I don't know from experience but I hear its a lot of work for not a lot of pay off. It seems like you use so much effort and machines and time, you really can't make a ton on it. I could be wrong. Obviously some people do it and have to make some money if they keep doing it. In my area, every other house has a sign out with firewood for sale.
I will be interested to see how people do it on here though, because I have an endless amount of woods to work with.