Yep, sounds about right. One thing writers should also consider is that they shouldn't expect to make huge amount of money from book sales. Books are a very harsh market and it may take a while before hitting a home run. Here is a great podcast from someone who's been a New York Times best sellers and it really shed light on how the cookie crumbles in that market for me: http://tomwoods.com/podcast/ep-234-all-about-publishing/

Thanks for the advices :-)