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Antique dealer here, and frequent eBay seller. Thought I would add my two cents if it helps.
eBay is a great platform for selling worldwide as it is quite famous and many people use it. It's also the best option for many sellers to get decent prices on certain items that are otherwise hard to sell or don't move quickly.
I live in Canada, and shipping overseas can be a nightmare because eBay forces you to put a shipping estimate in. This is fine when shipping to the United States, although I always ship tracked because if it doesn't arrive I am liable and can lose the money and the item. Yes, even if the customer gets their item if I don't track it they can say they didn't receive it and I lose out.
The problem gets incredibly bad when you ship to Europe, Australia or Asia. This is due to shipping costs being incredibly high, tracking being a must yet costing a lot and always being more than the estimated shipping cost. European buyers will want to pay the American or Canadian shipping cost, and get upset when I tell him the real cost overseas. When I tell buyers this they usually flip out, even if I leave a Caviat in the description. However, if I ban foreign buyers I will likely make less money. A seller wants foreign buyers to bid hoping that a local buyer will win instead, and the foriegn bidder will increase the items final sale cost, without actually winning it.
When I ship an item I try to pay as close as possible to the estimated shipping cost, however I usually pay two or three dollars over/under the estimated cost due to a wide variation in costs. American shipping is superior to ours.
I have lots of problems with eBay but at this time it is also been invaluable to my business. Changes in eBay regulations likely will not stop problems happening anytime soon. I will continue to buy and sell on me that as the benefits still outweigh the problems and costs.
I hope this helped, and feel free to let me know if you have any questions!