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Someone writes: The barrier is not monetary. The barrier is that the org is fairly script-centric - there's pretty much no interest in it for other than Roman scripts and vice versa.
I think that ATypI is already less focused exclusively on the Latin script than it was when I first attended a conference in 1994. A long term change in the membership demographic would further diversify the focus of the association's interest. I would consider this a good thing.
It is also worth noting that the Latin script is the sole or major major writing system of an incredibly large number of countries around the globe, so being Latin-centric does not necessarily mean being Euro-centric or Anglo-centric.