You know, I think the real reason this topic keeps coming up, not just here but throughout the digital community, is that no one is really addressing the real issue. The problem isn't really stock photos. People have been using stock photos for all sorts of reasons (no photo, CTs, art, etc) for the entire 3+ years I've been digital scrapbooking and no one has really cared up until now.
The problem is that there's a subset of digital scrapbookers who are combining digiscrap products with these stock photos to create what I'd call digital art. They aren't concerned with the memory preservation side of things, for them it's all about artistic expression, and since they aren't using their own photos or stories, there doesn't seem to be any real personal attachment to the pages they create. Which I think is making people wonder, is it really scrapbooking? And if it's not scrapbooking, then is it really fair that they get all this recognition through the DST gallery standouts, 50-60+comments, CTs, etc? That to me is really at the heart of why people keep bringing this up.
Personally I don't care one way or the other. To me it's kind of like the old paper vs digi or digi vs hybrid type of arguments. As long as all stores/galleries don't switch to that style of pages, I'll be fine.