I have a question for anyone that has been freelancing awhile. Now that we have these open source CMS available to us like Joomla, Wordpress and Drupal along with all the free open source plugins/extensions such as ecommerce, how does service provider charge for this?

Do you charge for the implentation only or for the software? Or is this all wrapped into the total cost of your services being provided?

I am under the impression that some extensions have the ability to be customized, whether its the functionality or the look and feel. I assume this would also be included into the cost?

Any advice would be greatly appreciated. Thank you in advance!