Great thread DustB. This is why I missed you during your long absense.
To the question at hand and I hope I am answering this correctly:
I think Chandler Burr's book The Perfect Scent and Cathy Newman's The Art and Science of Scent have had a firm influence on how I feel about this matter. Panic in the corperate office's causes trend. Best selling fragrance causes trend. The panic to "catch up" with those best selling fragrances ( on the market) causes trend.
Also, its sociological ( I think this is the correct term?). Is it appropriate to wear a certain type of fragrance considering things like the Aids issue in the 1980s ( loud fragrances). Or even is it apporpriate to wear a fragrance like Lauder for Men when it may be percieved as "unclean" smelling. I sometimes feel there is a social pressure to not wear alot of fragrances. But my age forces me into feeling this pressure as well ( I'l blame my age )