Those swords were in families for centuries, something considered to be worth way more than money, and they were passed down through generations of warrior after warrior - even if the owner was defeated Japanese honor said that the sword should be returned to the family. Obviously this was only a code amongst warriors, but when the war came, an enormous amount of swords went to the soldiers that were fighting in it... When they were killed, the Americans looted their bodies for personal gain, a war crime forbidden by the Geneva Convention, and took thousands of swords back to America as souvenirs, largely unaware of either their significance, or value... Most of these swords ended up in the hands of collectors and art dealers, who are now selling them for up to millions to the rich and famous.
There is a charity in Japan that buys these swords from the collectors to return to the families they were stolen from... A lot of shame was brought to families that lost their swords, a lot of suicides, a lot of stigma that still brings shame to families today...
For us they're just cool things to have in your house, to the Japanese they were stolen from, it's their entire family history which is traceable through the various trinkets, inscriptions and decorations on many of them... And now centuries of tradition are lost, and the only people that benefit are rich wankers like Dana, and scumbag 2nd hand dealers whosell the spoils of war crime which still cause people direct pain to this day.