I think mainly because there is no context. I wouldnt know if they were toys or models (or even real cars if I wasnt close to the pic). Is there a difference? Maybee. A toy means that a child played with it at one time. And that gives me warm fuzzies all over. A model means that someone painstakingly etched every detail into it. But without context, any relationship to humanity is implied. Thus it is the viewers experience with the image that dictates the response, and not the subject that communicates to the viewer.