Yes lots of scammers out there, not just aliexpress, i have been in many fights with ebay and ebay sellers, in my opinion ebay and aliexpress don't do enough to stop bad sellers.

Ebay should just make one little change, if a sellers product gets flagged as fake/counterfeit then that product cannot be sold and this should happen eminently, and afterwards get top priority at ebay HQ.

And they should have a sample process when sellers want to sell battery's and memory products (SD-Card, USB-Sticks etc)