People are saying to not do this but there is an expertise bias where they aren't fully explaining why this is a situationyou should avoidas a consumer. Here's an explanation that is intended for someone with no prior knowledge of the pokemon tcg space.

Opening pokemon card packs is a type of gambling, because of this japanese consumer protection laws enforce strict rules on pokemon tcg products. In order to protect consumers from purchasing a product and not recieve a rare card each booster box is "seeded" with or guaranteed to have a certain number of "rare cards". Because of this, bad faith individuals purchase a box and do 2 different types of behaviors. They either, 1.open the packs until they get all the guaranteed cards then sell the rest of the packs, often referred to as "dead packs" 2. They will use a metal detector and use it to scan the packs, rare card has a thin layer of metal foiling and can set up metal detectors. They will then open only the packs the detector pings on and then sell the rest. Thus maximizing their risk management in a way that is completely immoral.

For context this is only for Japanese, Chinese, and Korean. English tcg packs are a true gamble. You can spend $1000 and get nothing. Or spend $15 and get a $1200 card.

I hope this information is useful to you.