As a seller you should always send all your packages with insurance. This is a protection for the seller and buyer. And yes we refund or replace item if lost or damaged in transportation. Its a basic to selling.
Good Luck.
That's a bit of a generalization. I can see how YOU feel this way if your average ticket price is a few hundred dollars, but for consistently selling $1-$5 items, I'm definitely NOT insuring every items. It's then a cost of business if you need to refund for any one reason, as tobyshitzu mentioned.
Also, many of Canada Post's services do not ship with insurance/tracking unless you spend a lot more to upgrade the service. I've personally contacted a few third-party insurance companies, but most will not insure AFTER Canada Posts free insurance... they insure at $0, so you're paying for more insurance you don't need just so you can insure the packages without insurance -- and it doubles the amount of paperwork you need to keep to track all of the parcels for insurance purposes (not a small soft cost when shipping 100s of parcels a week).
Even with tracking, buyers can claim their money back through PayPal -- its really arbitrary on PayPal's part to decide who's telling the truth. And, if the buyer uses credit cards, they can frankly lie to the credit card company (who doesn't monitor ebay sales), and the Credit Card company will reverse the money to PayPal, who then reverses it to the seller. There's many ways to attempt fraud, unfortunately. We've been the victim of this once in our 3+ years of business.
In the end, make your own decision based on YOUR business, and don't let people tell you generalizations about what the 'basics of business' are.
Well, that's my 2 cents anyways. Heh heh.
John