It’s a lovely dress, and one that she’d pay tens of thousands for, if she’d bought it in a wedding boutique. But it’s unique and special to her and her new husband.
The full article said she paid 1500 English pounds, which is about - what - about $2,500; and it took the women who made it 67 hours. Sounds rather a bargain for all that work -- certainly in London it would have cost a great deal more. But as you said, the unique meaning for the couple, combined with the stunning originality, is priceless.