Thanks so much to all who gave feedback in both threads, that fixed it. I somehow missed following the nvidia thread till it's very end, Virtualbox working, might as well try to make nvidia work :)

On Tuesday, August 25, 2015 at 4:34:10 PM UTC+3, Stefan Mühlinghaus wrote:

Sounds like another side effect of the /usr/sbin transition. Juan's suggestion helped with my nvidia problem, it might work for you as well. Make sure your /usr/sbin directory is a symlink to /usr/bin before you do anything else.

- dkms build -m virtualbox-ose -v 5.0.2 -k $(uname -r)
- dkms install -m virtualbox-ose -v 5.0.2 -k $(uname -r)
- xbps-reconfigure -f virtualbox-ose
Before running xbps-reconfigure, make sure the kmods are built and installed correctly.