Wordpress is free ... extensions and work for it is not... you break a lot of other stupid laws just by providing wordpress in your list... example: you want a good theme for wordpress, you pay for it;
http://www.woothemes.com/ ...
when you buy vBulletin, there is NO STATEMENT written or even said that something else was provided for free... actually, ALL the extended services from Jelsoft are PAID too. support, addons, phone support, even the installation cost half of the software price... did you ever asked Jelsoft why they charged for an installation that takes 3 minutes ???
the problem with your entire thread is that you give not a single argument for releasing free stuff instead of charge for it...