US hand-blown wine-glass brand Glasvin ran into shipping, duty and surprise-delivery charges as it expanded to Canada, the UK and Europe. Refunds followed, and the founder said international margins had been close to zero. Shopify reports that after Glasvin adopted Managed Markets, checkout showed DDP shipping and duties, local currency and local payment methods before purchase. In five months, global sales rose 71% year over year, global conversion increased 11%, and conversion in Canada and Australia rose 122% and 109%. The earning mechanism is lower surprise and abandonment, not simply more advertising. Costs and risks still include platform fees, protective packaging, international returns and currency. The vendor case discloses no absolute revenue or profit.