Every agency has a different market, and they try to select photographs based on their respective markets. Fotolia is very big in Europe, including Germany, Scandinavian countries, and France. I might be wrong, but from what I see North European countries is a preference for photographs that are very white with people staring at the camera with a cheesy smile, usually all looking the same. So my point is , every market is different and every agency selects for its customers. It's not a personal thing.