I bought my Santi drysuit and undergarment while traveling in Europe because, all totaled, it was half the price of buying it here in the US! The exchange rate was good, and the base price was lower even apart from the exchange rate. Add to that the VAT refund I received when I left Europe, and the price was half what it would have cost me from a US dealer.
When I returned to the US, I duly declared my purchase at Customs. The Customs agent seemed surprised at my honesty. I got the impression that many people buy stuff abroad and don't bother to declare it. The agent asked me what the thing was that I had bought, searched on her computer for a few minutes, factored in the $800 exemption, and then told me what I owed. It wasn't that much--under 100 USD--so I had clearly come out ahead. But now, for the coup de grace, when I tried to pay, their payment system wouldn't take my credit card due to some malfunction on their end, and the agent said, "Never mind. Thanks for your honesty. Have a nice day."
Your experience was different because you brought it back to the US yourself. Many people think bringing back something and ordering from overseas are the same thing. They are totally different. And I can’t stress that enough.