I am using MacPorts SVN 1.8.9 on OSX Mavericks:
svn --version svn, version 1.8.9 (r1591380) compiled May 15 2014, 11:06:03 on x86_64-apple-darwin13.1.0 >
In the end I had to make the owner of ~/.subversion/auth/ the user I was using. After that the username and password were stored in the auth folder under /Users/userinqu/.subversion/auth/svn.simple . And yes. It is all working now.
~/.subversion/auth/