There is also a resistance to Latin American makers because potential buyers are concerned about the (sometimes nontraditional) woods and the conditions (more humidity there during build). I found this when I was trying to get the late Roberto Giormenti's basses known here. I think both reasons are unfounded. If Roberto or Andrea were in Italy or the US their prices would double, and not just from cost of living adjustments.
While Bobkay has a point about “never buy a bass sight unseen”, commissioning a bass from Andrea (and previously Roberto) is not like ordering a stock bass from Gollihur, Upton or String Emporium -- let alone the significantly less dependable/reputable online dealers.
With Andrea my experience echoes Flatback's: you engage in a custom conversation, in great detail, about your needs, playing style, price range etc, as you would with any custom builder here. So, in that sense, you are buying an "unseen" bass from Arnold, Nick Lloyd, Gary Upton, etc., as well, if you commission a bass that does not yet exit. You are betting on their reputations. We think Andrea's reputation should be better known.
I agree. I ordered my first bass sight unseen/unplayed from Upton, based on probably less real world feedback than what you and Flatback have provided. It's just an observation on my part, not something I necessarily think is relevant.