They are either very generous or very clever (or both). I ordered six sample vials and was blessed with two more for free that are to DIE for, and now it'll be even more of a battle to limit myself to two favorites when I eventually order full-sized bottles.
I haven't sniffed them all yet because just briefly opening more than one has overwhelmed the entire house to the point that it smells like the local Flaky New Age Neo-Pagan store I go to sometimes, which has a shitload of incense all over the place. Luckily I like it there enough that the huge mass of smells, while not totally pleasant, at least has good associations for me.
(Back in high school theatre, the director bought a fog machine and held it up and asked the class to guess where she bought it. Half the class yelled out the name of that store, because the smell of it on just that one item filled the classroom...)