In my experience their are two types of people selling photos at the juried art shows, the "let's try it and see what happens," and the serious pros.
If their is a "trend," it is to sell bigger, with less amount of effort from the photographer. Most photogs I talk to have thrown in the towel and have gone to some form of computer assisted printing, even B&W. Most of the buying public don't really care about manual efforts, they just want that big one for their home or office. This has always created a real challenge for me, and has been the primary target of my sales/marketing efforts. Sometimes smaller is better...but try and convince the public to pay more for something smaller. I'm selling an 8x10 for $50, and the guy down the row is selling a 30x40 inkjet for $49!!! BTW, that's the type of stuff the show directors are frowning on at some shows. Overall I think the photography itself is still very good, and even inspired, but it seems printing is being reduced to the lowest common denominator...
FWIW.