I know it's to early to draw a conclusion but did you noticed that all middle tier is very close together. It means that Veer advanced a lot while 123rf, BS and CanStockPhoto are going down. For me this month it's completely different 123RF is better than DT and BS, CanStockPhoto and VM earned nothing.
On the low end side according to polls PM is doing very well. I wish I have a patience to go thru their submission system and have more images online.