Shipping costs are subject to eBay fees so any seller who applies this tactic is still subject to the applicable fees and unless their domestic shipping costs are so very low, it really is a poor tactic..now having said that, are you referring to Canadian sellers or USA sellers? THAT DOES make a difference in that IF your reference is to USA sellers...it most likely means they don't want to do business with Canadian buyers unless the buyer does so on the seller's selling & shipping terms...and IF the TOTAL cost of that item(item price plus shipping) is an outrageous price, then any wise buyer would pass .... It is the TOTAL price that matters!