I had an item that only weighed 0.8kg, and this was CONFIRMED by the SELLER as well. However, Yoybuy refused to deliver it to me unless I paid a $50 fee, because when 'they' weighed it, it was somehow 7kg. They kept lying saying that they checked on a scale that it was 7kg but refused to send proof. The seller even contacted them to confirm the weight was 0.8kg, but the seller was ignored. I already waited 8 months for the item, so I had no choice but to pay.
I did eventually receive it, but it was something I ordered in March and received in November.
You might be wondering why I ordered from them when I was able to contact the seller just fine. Even though I can contact them, the overseas-price of a certain figure is 4x more expensive, so it was cheaper overall to pay for proxy-shipping but pay the domestic price.
Anyways dodge this trash-scam company. They add fees and lie about it even when both the seller and buyer can confirm their lies.