Volume discounts with no volume commitments.
I think that sums up the cons of DPC completely.
Those who have been persuaded to stay with the program have probably been given a boost in the Fotolia search results as a reward
While this is possible, I believe that the rise of sales at FT that some people have reported are not related to that.
My sales at FT in July were the best since March 2012 (both in number of sales and in Euros).
And I am opted out of DPC.
So at least it feels like I was not punished for opting out.