It's one of those "brandable" domains that may interest an Online Postage company (like Stamps.com) some day. If you are actually able to sell it to such a company who really wanted it you could probably get $500 - $1000. That means waiting for several years and finding ways to market it so that people see it. It is probably worth less than $100 right now "wholsale" - selling to other domain seller.
If you can think of away to develop it that is consistent with the future business that may buy it, then the value increases (as others have stated). Also - PPC parking may pay the reg fees while you hold it if it gets any traffic.