I've got a similar problem, not the cat wee one, but my skin very rarely "holds" a scent, so even if I do find something I like, I do like to spray the tester and see how it lasts before I spend any money on it. Seriously, even some of the expensive fragrances, I can spray on, and within half and hour I can no longer smell them. I thought that it could be that I cant smell them, but I've asked other people to smell it on me and they say they can't either.
I did take a chance once, though and bought the Liz Taylor fragrances from the channel,and the staying power on those are all pretty good. The diamonds and Emeralds fragrance is particularly good, and actually my favourite. Just a warning folks, (I know scent is subjective), but I found the Diamonds and Rubies scent was NASTY, I dunno what it's supposed to smell of but it's really quite unplesant, but it was in a set with the diamonds and sapphires, which is really nice!