Mike,
You've actually cleared up my confusion. I had been under the incorrect impression that all search results from the third row onward were first a mix of randomly-ordered, sponsored images... then followed by non-sponsored images... with only the top two rows of the first page being "FAA's top picks". So, since it's only the third row on the first page, that explains why I've seen the same images again and again while searching my sponsored keywords.
I do have my own website with good SEO where all of my work can be found and I market it there. For me, FAA is purely a means of branching out to provide a lower-priced option for my website visitors. That being said, I am sort of disappointed to see that FAA's search algorithm is set up in such a way that it's essentially useless for folks that weren't here since the beginning and never had a chance to get a leg up. I agree that FAA's search engine shouldn't be relied upon exclusively, but I think it's undoubtedly an avenue that a huge number of FAA customers use to find what they are looking for. IN that regard, I was hoping it would at least be a tool I could leverage to some benefit... I'm seeing now that that isn't really the case unfortunately.
On one hand, I understand that FAA would assume that top-sellers will make them more money... it's only natural, then, that they would feature them first. On the other hand, by so heavily favoring only the work that is already a big-seller, there's scant room for anything new to pop-up for all but the most unique keywords. Because they do it this way, the chances are fairly high that the same images which place in the first five pages of search results now for a given keyword, will probably not change much over the next couple of YEARS, since FAA is intentionally directing all buyer traffic only to the old, big-sellers and explicitly diverting traffic from new uploads (some of which may well be promising competitors if the search engine gave them a shot).
It is what it is, I guess. Like I said, I see FAA's reasoning. I just wish that they could find a better way to mix up the search results in order to give new uploads a fighting chance in their target keywords.