Well we dont have any sales record of Yakuza 1 for NA, Yakuza 2 sold roughly 50k in NA....I think Sega clearly knows what they're getting into when bringing Yakuza 3 to the west lol.
With almost 30k of Yakuza 3 preorders i'd say Sega should be fairly happy with that.
But im glad they're still bringing it over to the west as im a fan of the series and hope they'll bring over Yakuza 4 in the future.