I'm sorry to hear that. CBP should up the personal exemption given inflation too. It's not a great process, especially after a long flight! I don't blame you - my voice might have cracked too if i was under such strict scrutiny! Reading this thread, it seems like LAX is more strict compared to other airports. A couple of posters mentioned they were given a flat 3% duties rate or they were waived through. LAX is my home airport as well. I self declared at passport control and they made me wait almost 30 minutes off to the side before someone felt bad and escorted me down to the customs station. I had to collect my luggage and the officer was waiting for me with my passport in hand near the exit. I had two ladies and while it was not a supervisor/trainee team, i did feel that the two female officers judged me extensively for what i picked up. They even asked me for my salary and when i asked if it was mandatory to share that, the one watching the process (and checking the other officer's math) said that it seemed like a lot of money for someone to have on hand and could seem suspicious. I did end up sharing and that shut her up but still.....so awkward. Even though I self declared, i wonder if they have me flagged in the system going forward so they'll assume i went shopping on every european trip.
Prior to going, I built this massive spreadsheet that tracked price comparison factoring in US customs duties, VAT refund, currency conversation and US sales tax. Having gone through this process, i'm only going to buy things in europe that are significantly cheaper lol! Usually that's Hermes, Celine, Dior and LV. But I'm going to avoid VCA, Cartier, and Chanel since retail price is usually very close to US prices before tax. And the VAT refund really doesn't result in much savings. After the fee Global Blue charges when they transfer your refund, a VAT refund of 10-12% usually comes down to less than what's on the receipt. I usually lose some the actual refund due to me when i see it on my credit card statement (and i have a no foreign exchange fee credit card). And now that we have to add in customs duties, it makes the savings not even that worthwhile lol