Good point about the tracking. If you print your shipping labels through Etsy the tracking is included so that saves you $0.80 or so. AND the postage is cheaper than if you went to the post office. AND Etsy automatically sends an email with the tracking info (and a little map, pretty cool) to your customer. Much, much easier than going to the PO, especially this time of year.
If there is a problem with the package getting lost, it's so easy to see what's happening with the tracking. You just click on the order in your record and there's the link to the tracking.
I think we sometimes get mislead into thinking that the 'shipping cost' should the same as the postage price. It's called shipping and handling for a reason, because there are labor and resources that go into this aspect of your product. This is also where your branding can really stand out as a business.