I for one doubt that the secondary market will rebound any time soon.
I also believe that the "lighthouse craze" which has swept the country for the past 10 years is also on its way out. This partly explains why there is less interest both here in the forums and in the secondary market. An oversaturated market of lighthouse products has made for many houses overflowing with lighthouse stuff. A lot of collectors are selling off and finding other interests.
Just a few short years ago one could find on Ebay at any given time 300- 400 listings. Today there are over 7000 of which about 250 are Harbour Lights.
There is too much product for a market with a dwindling interest.