I love this post from another design/development firm: They actually suggest (rightly so!) that developing a site in WordPress can charge livable rates. Just because WP is well-known and easy for site owners to update does not mean it is free to build in.
Shero is a development firm that acknowledges that all sites are special and unique, and gave some simple framework to help business owners looking to hire a serious firm can use to plan their costs. Things start at $2,400 and go up from as features and customization are added.
They do what I do as well: training is part of the cost and it should be because as a business owner, you need to be empowered to use and update your site just like you'd update and continuously improve the other parts of your business.