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| MediaWiki software is Free Software (as defined by it's license). Vendors charge for added value such as hosting, support , training and service-- including customization for your specific needs.

You pay per the seat for a Confluence license. There is a free option for open-source projects. There is a reduced price option for non-profit organizations. You also With Confluence, you even pay for add-ons simple features (Title redirects!) that are included with MediaWiki (even simple ones like Title redirects!). You also pay for added value such as On top of the licensing and software costs, you would still have to budget any remaining dollars toward hosting, support, trainingand service. Some things are just not available at any price (e.g. customization).