I'll admit it.
I ordered a wireless mic off of one of those sites. It was only $40. I figured my bank would refund my money if I got scammed, so no real risk.
I got an email the following day that my order was cancelled. I received a full refund a few days later. I also found that I couldn't log into the shady website anymore.
Then I started getting key chains in the mail - just cheap little trinkets. The return address was from either Kyrgyzstan, China, or Hong Kong. I received 15 key chains in all.
The scam is called "brushing".
They needed my name, address, and credit card to write "verified reviews" of products on Alibaba. I learned that Alibaba's search engine ranks search results on "verified reviews". Each time they shipped me a key chain, it was against some fictitious order of a tablet or other item from Alibaba. Then the scammers wrote a glowing review of the item.
I wasn't out any money and there are probably 15 reviews from "Steven H." written in broken English somewhere on Alibaba.
Besides the minor hassle of having to replace my credit card, the whole experience was surreal and funny as hell.