I love stock photography, my favorite hobby. When I have a chance in my busy life, I go over my photos and look for the "Dreamstime quality" ones that I can submit. Even though I have still a very small portfolio, I try to understand my statistics to find some kind of pattern and hope that my numbers will get better over time.
There are so many Myths I read over the years about how uploading in a constant manner will give you more exposure and more sales, how your acceptance ratio influences your placement in searches, etc.
Well, after increasing my portfolio over 50% in the last three months or so with my acceptance ratio higher than ever and seeing my sales plunge, the revenue per download in a record low, I can be certain that all that theory is wrong.
My conclusion is that the sales are influenced by Seasonal reasons and just "plain luck".
Sorry if I disappoint the theory makers or the hunters of the Holy Grail of stock photography out there, I don't consider myself an expert and I know that my portfolio is too small for any definitive conclusions, but I am convinced that most of the increase exposure advise is just "wishful thinking".
So, I'll keep shooting and increasing my portfolio for the fun of it, hoping that my luck will get better!