It depends on what the letters are in the domains.. you should make a post in the domain appraisal forum and see what other members think of your domains.
It depends what you are holding. Just like in the LLLL.com world the same value applies. Is it quad premium, CVCV, or pronounceable? Then it has value.
If it is something like QZXJ.net or something it is worth about reg fee.