I really like the music analogy -- that makes intuitive sense to me. One could even compare the vast number of samples/decants (vs FBs) one has to the iTunes craze. So few people buy complete albums any more -- they just try out/buy the tracks they think might appeal to them. If it turns out they hate the song after a few plays, they haven't spent a bunch of money on the album. Same with fragrances.
Two other analogies I've used are wine and shoes.
People who have wine cellars or dedicated wine refrigerators keep them stocked with wine, and they may never drink all of it. But, really, who would choose to drink the same 3 or 4 wines, over and over, for the rest of one's life?
This one is probably easier for women to get away with, thanks to Sarah Jessica Parker and Sex in the City: I just say, you know how some women are gaga over shoes and have a gazillion pairs? That's how fragrance is for me. People look surprised for a split second, but then intuitively get it.
But, yeah, overall, I don't talk about it much at all with people who don't share the love. I did, however, choose to prepare the twenty-something young woman I hired to dogsit for my beloved Dugan while I was away on business trips, before he passed away. I even invited her to sample away. She did and had a great time doing it.