"the fact that the lighthouse fad is over"

I said this five years ago and not many people believed me.

One can collect just so much stuff and that's it. No more room. So you stop buying and then you start selling the stuff that you no longer want and usually for a whole lot less than you paid for it. This is especially true for Harbour Lights. Just go on EBAY and see how little most of them are selling for. (if they Sell at all)

There are not enough newcomers to the market to sustain the "fad"

Also there are not too many younger people interested in lighthouses or getting involved with preservation groups. I would believe that most of us who really like lighthouses and are involved with one or a few lighthouse groups are over 40 and probably over 50. Most that I know personally are over 60.