This is an interesting thread, and I'd like to add my two bits...
There has been no mention yet of deodorized, or non-deodorized cocoa butter. Sebastian would know better, butmy understanding isthat most of the cocoa butter used today in chocolate is deodorized, because most of it is made from cocoa beans that nobody would really want made into chocolate and by itself smells horrible.
If in fact the cocoa butter IS deodorized, then origin is for the most part irrelevant as the cocoa butter is used solely for it's fluidityand crystalization properties. It in essence then brings absolutely nothing to the chocolate in the way of flavour.
I read in here that Askinosie makes their own cocoa butter. Interesting indeed. Is it made in the US, or at origin? I would certainly like to do some financial costing on THAT cocoa butter if it's made in the US! Well.... No... Not really. Paying a high price for, the beans and their import costs - all by weight -only to press out the fat and leaving 60% of the bean as waste doesn't seem viable to me unless they are doing it to make their own cocoa powder, which in that case would make sense. Sometimes I wish I could make my own cocoa powder.
Anyway, given the typical uses for cocoa butter, and the source of the cocoa butter it does make sense that there is very little single origin cocoa butter around.