Concerns raised over kids' addiction to card collecting

Seven-year-old Miaomiao is already an experienced card collector with three years of experience.

"I always felt very excited when I drew an SR(super rare) card or better," Miaomiao said, mentioning her grandmother's routine of buying her card packs on Tuesdays and Sundays from a neighborhood shop in Beijing's Shunyi district after dance lessons.

Her card collecting came to a stop when her mother stumbled upon a drawer filled with cards, many of them duplicates. Those cards, which were bought for over 1,000 yuan ($138.90), ended up being sold for just a few tens of yuan on the secondhand goods trading platform Xianyu for a quick sale.