I think the problem is when they buy cheap carts on Yahoo Japan, and resell them at twice what they paid.
This is absolutely the main problem.
Honestly, put it into perspective, you buy something for a price, then charge twice that price for it.
That's a 100% profit. What other small business do you know of that mark up their products that much that you don't consider a rip off?
I think it's stupidity on the buyer's part almost more so than that of the seller. I mean for example, let's say $hawn or someone discovers a source of Euro Kizuna AES. A quantity so huge that the product is no longer considered rare/etc, BUT, begins to sell them for $2100 each. A lot of people here would piss on the forums about what a load of shit that is but more people than that would just buy it without question.
Why? Why is it that when people see things like this on Ebay and what not they just assume that oh, this is what the price is then instead of thinking hey, this is obscenely high?