Many Chinese sellers will list items on Amazon for a multiple of the price listed on AliExpress. You're essentially paying a multiple of the price for faster shipping.
And a middleman that will give you your money back more or less no questions asked if the product doesn’t match its description.
Getting something in two days instead of two months and being able to get a refund if it was completely misrepresented is easily worth, say (as an example from today), paying $50 for an IP cam instead of $40 from Aliexpress for something with firmware so butchered from upstream it doesn’t even fulfill basic requirements or provide listed functionality anymore. And being stuck with it.
At least the firmware is so full of security holes I can probably find some use for the device one day when I feel like spending another evening with it.
Also if you're looking for Chinese knockoffs.. go directly to the source and go with Aliexpress.