I agree with most of what has been said.
Marketing, the power of suggestion, familiarization, and the fact that age group the Abercrombie scents are marketed to really isn't exposed to many fragrance choices, imo...Think about it, how many fragrances were popular in high school? Just a few. And although they didn't follow trends quite as much as the clothes, the girls recognized the smells of not only Abercrombie Woods (in my HS days), but Acqua di gio, Polo Sport, etc. even if they couldn't name them, and thought that they were the greatest smells in the world - probably because they had positive associations with the guys that wore them.
Abercrombie colognes remind the wearer and the girls of the store itself, which is an exciting trendy experience to shop at (or at least Abercrombie would have us believe so) and I'm sure this adds to the appeal.
Personally, I LOVE Abercrombie Woods and Abercrombie Signature...two great colognes from my HS days. Both are now discontinued and are selling for almost $200 a bottle on ebay. I think this is not only due to the scarcity of the product itself, but the fact that these were some great scents that many people in my age group have very positive nostalgic associations with. I REALLY wish Abercrombie would reissue these!
So I like them, and I can see why today's girls like today's Abercombie scents.