I agree with what others are saying. The bazaars will just move to another Jeuno area, and cause congestion there. Why not just retax all of Jeuno? Or make a bazaar area for people to bazaar in... I mean... Whitegate is all but empty these days.
Even taxes though won't stop the bazaaring... Whitegate is the perfect example of that. Back when ToAU areas were the pt spot. Jeuno was pretty empty, and Whitegate was always packed. Including people bazaaring.
Best solution, make an area just for bazaaring. No NPC's, no quests, nothing but an entrance and exit. Would cut down on a lot of this congestion in normal zones.