As of 2019, WikiSuite is "worth" between 50 and 100 million $USD.
Yes. If you tried to re-code WikiSuite using proprietary models. Ref: https://en.wikipedia.org/wiki/COCOMO
Like Wikipedia, GNU/Linux and Firefox, WikiSuite is the result of massive collaboration.
Nope. Just the Linux Kernel would cost billions to redevelop
The WikiSuite-specific code (mostly ClearOS installers):
0.2 M: https://www.openhub.net/p/wikisuite/estimated_cost
This is intentionally as small as possible since we focus on upstreaming code to the various Software Components
That is true of all feature-rich software. But the economics don't make it feasible to build software just for your needs. Community Free / Libre / Open Source software will necessarily want to cater to a wider community and get more users and contributors.