People like the sensation of being fancy, but what does that word even mean?
When you stop to consider it, that's a really broad category.
The term provided by Merriam-Webster is "not straightforward," which, to be truthful, is completely meaningless.
Another, somewhat more precise definition is "of special perfection or highest grade,".
Conjures up images of ostentation and high cost; for example, champagne and caviar are universally acknowledged as expensive delicacies.
The outliers stand out more when money and quality are often considered to be synonymous.