I think that Content Paradise is one big reason for the upset. It's really the new kid on the block and it's a big kid. Look at Daz. It has thumbnail rules; so does CP. You can buy Rendo products on Content Paradise and look at how a lot of Rendo's merchants made CP their mainstay market place exclusively and used to sell exclusively here on Rendo. Couple that with the TOS. The thumbnail thing is not the major problem really. Now figure Rendo has to pay Content Paradise a cut of everything sold there and that comes out of their cut. I look around at the different sites and a lot of the vendors from here have banners in other places now. They hunt the high volume markets and sell on a variety of them. The new exclusives they give to places like here at Rendo ,CP and Daz.
The smaller sellers get their vintage products because they get more for the "new" exclusives on the power seller sites without the penalties plus they get advertised in a high traffic area. But these merchants are very popular. Everybody wants them. They sell wherever they go; so it becomes a matter of where they will sell the most.