I am in New England (USA). These rates are a reflection of what I've seen companies are willing to pay, not necessarily what I'll accept. For example, I have not found an effective way to get more than about $40/hr for Wordpress maintenance, so I have shifted to more backend and webapp work. Also, these rates are more of an average. Depending on the length, stability, and enjoyability of the project, I may be willing to work for more or less money.