Patently Apple:

Late yesterday Apple filed a trademark infringement cases against Mobile Star LLC for selling counterfeit power products such as power adapters and charging cables through Amazon.com. Apple believes these counterfeit products could lead to fires and are therefore a risk to the public.

Apple recently purchased a number of Apple power adapters and charging and syncing cables (collectively “power products”) that were directly sold by Amazon.com – not a third party seller – and determined that they were counterfeit. Amazon.com informed Apple that Mobile Star was its source for the majority of these counterfeit Apple products.

Apple’s internal examination and testing for these products revealed almost 90% of these products are counterfeit.

It’s understandable why people want to buy adapters and cables from third parties because the Apple-branded ones are ridiculously expensive. But, their quality is undoubtedly suspect which is why Apple wants them off the market.