There could be a reason when it comes to card fraud. Card fraudsters need a way to check cards before they use/resell them, so they find a cheap e-commerce and automate the checkout on a low-value item and run the card numbers through there.

Of course, this is a problem manufactured by the card payments industry (we've had the cryptography to make card fraud nonexistent for decades) and it slowly getting fixed by 3D-Secure (also called Strong Customer Authentication) and as usual the US are behind.