One of the most frequent questions I get asked is how much money I make writing. Really? Do you ask your doctor that? Your garbage man? The clerk at the local WalMart? Sheesh.
But I suppose it's a valid question in the sense that everyone's got a book in him and wants to know how much money that book is worth. Honest answer? Not much. I've been at this game for ten years and I'm just now starting to turn a profit.
I suggest that the real question isn't how much money will you make, but how out of control is the passion inside you to write that book?
I figure it comes down to this . . . if you truly love what you're doing, you'll keep doing it unless God pries your fingers off that plow and shoves a different one into your hand -- and that has absolutely nothing to do with money. Until then, go after your passion with wild abandon.