I don't think there is an increase in selling single fans, some sellers just always sell mostly single fans. Living in the north I very seldom purchase single fans unless it is something hard to get that I want to add to my garden. Single fans take longer to settle in here usually, double fans do better. I just avoid those listing single fans, there are plenty of sellers and I watch for those selling double fans. I have been purchasing daylilies on the LA for years it does take patience finding the plants you want. I do like the LA without them my garden would have a lot less daylilies, which in hindsight maybe wouldn't be a bad thing.
I take it you were talking about the Lily Auction?
to ATP it is a good place to for all sorts of gardening information and to just interact with other gardening folks.