korean and international Queen's will buy T-ara japanese albums/singles too. doesnt mean only Sweet Treasures will buy japanese albums/singles and korean Queen's will buy korean albums/singles.
Jewelry Box didnt sell much? it sells more than 100k..
LTW is just a subunit's song. yeah QBS is popular in Japan but in korea and anywhere outside of Japan, it's always EunMinYeon. Some people will only buy for their bias only.
me myself dont bother to buy LTW and Target because i know both songs will be included in Treasure Box. Why would I spend on LTW and Target if I know i can get both songs on Treasure Box? the real "star" here is TB, not Target or LTW.
LTW and Target also have 1 version respectively. We are all aware that Bunny Style sells a lot because it has 10 versions + heavy promotions.
Treasure Box has 3 versions + they will do a tour of promote Treasure Box. They promote TB in the same way they promoted JB, which is japan tour + multiple versions. But this year, their Japan tour is on a larger scale then JB tour. So TB should sell as well or better than JB.
it is true that anti-korea sentiment is stronger now. yeah they might not be able to gain new fans, but hopefully long-time fans will still support them
plus, full albums usually will outsell singles