I do not know why companies insist on buying domains. We have given domains to open source groups for years for Free including Drupal.com, OsCon.com, and many

I do not know why companies insist on buying domains. We have given domains to open source groups for years for Free including Drupal.com, OsCon.com, and many others. and yet we have companies insist they want to own the domain. We are "open source for domains" - don't they understand it is free to use?