Plum Plus Yellow Equals ... ummm What Does it Equal?

Last night I went to a handful of designer boutiques (Saint John, Yves Saint Laurent, Giorgio Armani, Donna Karan) and with each one I was given a harsh "Hello" and a cold stare. Some sales people gave a me a look and then asked me "Is there anything I can help you with?" And when I told them that I was looking for new material for my blog, they would flash a wide smile then slightly huff and roll their eyes. But this was not the point of my post. Read the next section for further information:
Let's play a little game, shall we? I'm the customer and you are the designer. Now think. If almost all of the other designers were showing plum for fall, wouldn't you (as the go-to designer for unique and interesting pieces) want to be showing plum with yellow accents? Yellow is the complementary color of purple therefore it makes perfect sense to use it sparingly to bring a little color to, say, an all plum shoe. But, the thing was, I didn't see any designers showing this color combination at all. In fact, I practically didn't see any color combinations at all. In a recession, I would be the designer with the interesting yellow accents that would lure my customers in.