An unopened vintage bottle of Givenchy III for $166 and Acqua Di Parma Iris Nobile for $164 - both gorgeous and worth the risk.
I admire all those sensible souls that sample, sample, sample, but really I would never buy a full bottle of anything if I sampled, because then it's a known quantity. I even drag my heels over repurchasing stuff that I know I love. It's like buying dishwashing liquid. Obviously I've got a bad case of novelty-itis, which sits right up against a bad case of full-bottle-itis.
Conversely if I did overcome my need for risk and novely, and wanted to purchase a full bottle of my sample, I'm then paranoid about the samples being the same as the full bottle, since I now have an inbuilt expectation of what it should smell like.
And on it goes - that's just the tip of the iceberg as to how and why 'conflicted' persons such as myself buy what we buy.