One of my personal rules is never to hold domains in my account that are worth less than $100.00.
This is because renewal rot will eventually put domains worth less that $100 in the red anyway. If you hold a domain in your account that has no value, you are putting good money after bad.
Therefore, deleting the domain will:
1. Prevent further monetary loss.
2. Allow you to focus 100% of your energy on profitable activities.
3. Improve your overall portfolio by removing domains that have little or no value.
Hope this helps......