I'm surprised how slow the ads are coming. I would have guessed that March and April were much busier for those trying to trade up for something this year.
I have found trailer sailers more difficult to find on the used market than keel boats. The storage and repair costs on keel boats are high enough sometimes people would do just about anything to get rid of them. A good dry sailer kn the other hand costs basically nothing to own if you aren't using it, so the incentive to sell just isn't there.