I always wondered about Duty Free shops. I've gone inside and bought things there (as emergency gifts) when going overseas. Do you think they are traps for people who couldn't make it to the malls or are there real benefits?

And what about the on board Duty Free shops? I once had to sit besides these two older women on a flight to Rio and they both tried EVERY fragrance on the cart. I had a huge headache after that. If there was any way to try all the licquor too...