What criteria to use on deciding to renew a domain

[FidelityOne]

I have a domain with a domain authority rank of 16 and 0 inbound links.  I have owned the domain for over 6 years and no longer have any use for it. Additionally, it has no good keywords in the domain. It has been a one page website for about 4 years.

The broad question is what criteria do people using in deciding whether or not to renew a domain name? I have a bunch coming due and am interested if I should take the time to try and sell on SEDO or just let them expire.

Whould love to hear how people handle this situation.

[EGOL]

If the content is any good, post adsense on the site and see how much it earns.

[FidelityOne]

It only gets about 500 unique visitors per month so given that statistic,  it would only make maybe .60 cents per year.  Thanks for the reply however.

[ASOS]

Have you thought of 301ing it to your stronger sites - passing ever a little bit of authority over to any other sites you have is one idea.

Sounds to be like the site is very flat and not really adding much - I would look at the less is more approach.

[FidelityOne]

I have thought about that but what criteria would you use to decide if it is worth the $8 bucks for the renewal.

I own a couple hundred domains and am also trying to also figure out whether I should stop renewing them and let them expire or 301 them to one of my industry related websites.  I understand that seasoned URL's that are keyword specific can add small bit of value, but how much value.... $8 worth per year?