I've never used calculated shipping, so perhaps another seller can answer your specific question, but I wouldn't be surprised if this were one of the reasons that the majority of eBay sellers use flat rate shipping. According to a comment fairly recently by one of the eBay.ca staff, that number is something like 70% of sellers.
The advantage of flat rate shipping is that the seller has complete control over what shipping costs will be -- and as a result, how much protection the seller wants or needs, and how much in FVFs on shipping the seller wants to pay. Given a choice, I think most buyers will pick the cheapest shipping, which in some cases is not appropriate for the seller's needs (e.g. expensive item going overseas). As an example, on items over $250, I stipulate Xpresspost to the US and internationally, but usually discount the shipping within Canada to a flat $5 or $10, or sometimes free. This works well because most of my buyers are in the US or overseas anyway.
Perhaps offering free shipping domestically is the only way to benefit from the FVF break if you use calculated shipping -- I don't know. Otherwise, I don't see how eBay can come up with a domestic figure to base the FVF on if the sale is actually international. Someone who uses calculated shipping may be able to give you some hints.
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