Well, such services do exist and, irrespective there are no searches, it's a domain name that clearly explains the service. There are SMS money transfer services and also sites claiming loans via SMS (how legitimate they are I don't know). So there will be a buyer out there, even undeveloped. There's no harm in making contact with the sites that have bad domains (or a brand name, but still might be interested in such a name for marketing purposes).
As for value? High $xx to low $xxx (like the really low end).
Good luck.