well a day trip into the city from the burbs it shouldnt affect much, figure it'd cost you $1 extra at most from the 2 or so percent increase in the tax from before, that is unless you were to buy some big ticket items. People living in Cook County and tourists really get hit the hardest.
And for Chitown.. Open Mouth? or closed?

Favorite Wood Coasters: The Voyage, Ravine Flyer II, Thunderhead, Balder
Favorite Steel: Voltron Nevera, Steel Vengeance, Expedition GeForce, Olympia Looping
Parks visited: 232, Coasters Ridden: Steel: 894, Wood: 179, Total: 1073