Sounds like a case of fishin' where the fish have already been caught. The fish caught will be replaced by other fish in short amount of time. Go back
again and try the same place in a week and you will find new fish where the old fish were caught. The fish will be consistent in replacing fish that have
been caught. You have to be consistent in going back before someone else does. That, or you can find your own honey hole and keep it a secret.
And you know how hard it is to keep a good secret.