Should I sell my PC since I am using OS X more and more and almost don't play games anymore?
At the end of the day it's all about your lifestyle and plans for the future.
If I were in this position myself I would either turn it into a mini NAS or home server or keep it for compatibility if you ever need to run Windows only apps again or want to gme.
Heres a list of things you could do:
- Start a PLEX Media Server on it
- Boot FREENAS and have a file server for backups and other stuff.
- Run Unbutu or another Linux distributions and experiment if your interested.
- Keep it as a backup in case anything ever happens to your MacBook, not as good as having another apple device to match but it will still work.
If you are genuinely uninterested in any of the above and know you will never need it again then you can consider selling it. If you feel you might want to game again in the future on it but don't have the power you want you can always upgrade it later when you decide you want to.