Blame the victim? Unfair market? Legitimate fraud? But seriously, studies continue to show that American shoppers are highly susceptible to simple tricks:

Shoppers do crazy things. And retailers bank on it.

Several studies reveal how Americans shop in irrational ways, and increasingly scientists are figuring out how easily we can be duped. Retailers in turn use these tricks to get inside our heads, encouraging window shoppers to become real shoppers, driving purchases of sales items regardless of real value, and helping buyers feel good about the things they walk out with … often for no good reason.

I find the “retailers bank on it” phrase a bit cold-hearted. Now that we have motive out of the way, tell me the difference between a retailer and an underground economy site.