The same item if you add to card if cheaper then you offset your coins. For example : I look out for a SD adaptor which is $0.58 and add it into my cart it is $0.58 but if I go to coins and offset my coins it became $0.60 after deducted my 3 coins. So their coins is offset but added on price if you use coins. That is why their giving you so much coins to look good in your account. Unlike shopee the coins are genuine and it can offset directly from what you search. But for AliExpress you can do it directly after you add into your cart. They will show what you have view before in the coins column and show you a number of coins it will deduct and the price after deducted as if you are getting it cheaper but if you really go and do some facts finding. It is not genuine at all. Attached 2 pic. You will see the second pic show 5% coins off. And it is more expensive after 5% coins used.