Have you posted to the message boards at Ancestry/Rootsweb or other genealogy sites and not looked at your message in a while? Have you gotten a response? Remember that even if the site allows you to be notified of a response, that response might have gotten stuck in your spam filter.
Also some users don't view the "old" posts because they are concerned that the emails are out of date, etc. Consider re-posting messages to boards with updates in your information, etc. New people are getting into genealogy every day and there may be new relatives just waiting to be found on the message boards.