If they sell cosplay customes based on popular shows, you know people will be queuing up to throw money at those made-in-china products.
Having the rights to ship out the offical crap could be a gold mine for them.
Just take Squid Game. It’s a regular training suit and they already exist as costumes and they’re easy to copy, but you can’t find the real one because of all the copies.
Same idea as the Universal Studios parks. Just without the park, because the income is all in the souvenir shop anyway.