This is another reason why I believe gaming on a console is so much cheaper than PC gaming without having to worry about low fps and whatnot...now imagine having to invest in a GPU just to get better video memory or fps with lots of money for a used item that can die any time... and also the worst part about buying these products is that they are not covered by a warranty if you will be importing them from some other part of the world, in a nutshell, some bad business practice from our Chinese friends to be honest needs not to be supported.
You can find scams everywhere where the price is cheap, such as selling cheap cars at auctions in the US, where people can check the car only after purchase. In China, there are new and used good video cards with a guarantee, but not everyone is satisfied with a 10-20% discount.