That might sound like a silly question as we all know that Joomla cost zero pounds, zero dollars, zero euros, zero yen, zero yuan etc. But it is not as simple as that.
Earlier today I twittered
Trying to write new blog post "how much does #joomla cost" not easy. struggling with some of the math.
One of the slides I had to drop from my "Hidden Joomla Secrets" presentation was an ugly hack to solve what for me has been a long standing issue with Joomla user registration.
By default joomla provides no method to pre-approve registrations before providing access. Currently there are two choices
There is no option for the site administrator to approve registrations first. For me that has been an issue on many sites, hence the ugly hack, and I see many people installing complex extensions e.g. Community Builder to resolve this simple issue.
The web was meant to be read, not squished.
This isn't the way to test a responsive design.