Did you know eBay is collection GST on items you are exporting, GST is for sale to Canadians when you export to USA or international you do no charge GST You are losing 13% GST because it is eBay policy to collect Someone at eBay did not read the GST rules
Are you confusing things with the GST you pay on your seller fees? GST (Canadian) doesn't get charged to buyers outside of Canada unless there is some random bug.