I recently went through all of my items listed on Etsy and redid all of the listings so they would have calculated shipping. This means that now my shipping costs are exactly what it costs me. Before I had to kind of average the costs for across the US, people near me paid a little over, people across the country paid a little under. International shipping was even worse and many international buyers got shipping overcharge refunds because they paid anywhere from $2-$8 over the actual shipping cost depending on where they were and what the shipping rates were right then.
This also means that multiple item shipping costs are much, much, much more accurate now. I had to kind of guess and round the numbers before depending on the weight of the item and what I thought you might be buying it with. Now that I can just put the weight of all the items in and let Etsy do the math for your specific order this is no longer a problem and it means combined shipping costs are lower than before.
While the cost isn't lowered that much, about $0.50 per item, it is still lower and I am happy to pass on that savings to you. Let me know if you have any questions about shipping costs and I will do my best to answer.