The point people seem to fail to mention about duty free purchases is that you don't pay duty abroad because there is an assumption you will declare the item and then pay whatever duty your country assesses. It's to prevent double taxation, not to provide you with cheap items. It's not like a "get out of jail free" card where you "save money." You only save money if you cheat on declaring or declare and are not assessed.
Totally agreed with you from a lawyer point of view.
Can’t tell you how many times my client travelled out of Australia and claimed 10% GST ($800) refund, then entered back to Australia with the bracelet on her by lying on the declaration card.. Customs questioned her and cancelled her refund and give her a warning.
Same with Chanel bags, omg, people think it’s fine to give their Chanel jumbo ($8000+) to a friend to bring overseas and back without honest declarations, so they can claim the 10% tax refund? That’s not how it works, and you can be fined heavily.
I guess people just think they can never get caught. But in fact customs are getting much smarter than you.