I think there is similar service that works with amazon and it uses monero for payment, but I heard that service has some issues.
Maybe you should also include more privacy payment options in Zellix, including monero (if not already accepted).
Serving only US customers and 10% is a no go forme to try this service.
KYC wise, we have no requirements and that wont change.
I have had no KYC or fund tracing on btcpostage.com for coming on to 10 years and the same will apply to zellix.com
What happens in case if some order is not delivered or it comes damaged?