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I don't get how the base model is $5500 in his vid, but on Sigma it's £6250
In the UK there is a version with 105 Di2. This is priced at £4250 (about $5000). This model is not listed on the US version of the website. The two highest models are priced as you would expect from a simple currency conversion; it is only the lower models that are priced "strangely". However, this pricing seems consistent with economic theory on price discrimination: the existence of a lower base model in the UK would make it optimal to raise the prices of the higher level models (particularly the second highest UK model).
(Another explanation might be cost differences that are somehow relevant for the models lower than the top tier.)
I don't get how the base model is $5500 in his vid, but on Sigma it's £6250