I think we all know what it's like to suffer the unapologetic, indiscriminate toying with the perfumes we love. As I have mentioned to MdM, Lanvin, still in charge of all their parfums, does exactly the same thing. I guarantee, it's 100% financially based. "Whatever is cheaper, they'll never notice." I work for a manufacturer of an unrelated product, and that mindset is not unfamiliar to me.
On the other hand, I have perfume ADD and while I've got many faves, I can be easily swayed with one whiff. Being a woman, I'm quite used to this treatment, considering they are constantly discontinuing favorite lipstick colors, mascaras, creams, bras ... you name it, if I like it, it's as good as gone. So I've learned to adapt. There are many wonderful new perfume houses, Bond No 9 is one I particularly like, as well as Frederic Malle. You can also buy up as much of the old stuff on eBay that you can. There's tons of it. Thank God for eBay!
Another route I like to go is to find out the notes of a perfume and try to concoct my own mixture with essential perfume oils. While I haven't been able to ever mix anything to replace the original perfumes, I have made some very nice, very interesting mixtures that I regularly wear.
BTW, I am as glad for synthetic ambergris as I am for synthetic civet! Thanks for clearing that up ... I was concerned!!!