Is GNU and Open Source software worth the costs and risks?

From Joomla! Documentation

It's difficult, if not impossible, to argue against the value proposition of GNU and Open Source software, although some have tried. Due to zero licensing fees, lower administrative overhead, high-quality code, security releases that are distributed in minutes or hours rather than months or marketing cycles, and free online support from thousands of like-minded developers and users, GNU and Open Source offerings are often the best solution. The math is really quite compelling:

Applications Industry Leader Cost
GNU/Linux Yes 0
Apache Web Server Yes 0
MySQL Relational Database Yes 0
PHP Scripting Language Yes 0
Joomla! Content Management System Yes 0
Thousands of Joomla Extensions Varies 0
Support Relative Quality Cost
Joomla! Project Leadership Team High 0
Joomla! Forge High 0
Joomla! Online Forums High 0
Joomla! Documentation Medium 0
Thousands of Online Volunteers High 0
Paid Professional Support Widely Available 0
Total   0