Personalize their next visit. Take them where they were before. Show them their previous list of purchases. Customers do not want to trudge through your Website like a stranger on the second visit. Some customer do not want to use credit cards, but they want to buy from your company.
Many potential customers avoid imposed shipping fees.
No Return Goods Policies Things come back. You must develop a Return Goods Policy and clearly state it on your site. Foreign Customers Global or not, foreign customer will try to purchase your products.