There are plenty of reliable scalpers out there not just Gold Coast. For a Chicago event a Chicago based scalper (such as Gold Coast) would have a better price because they are selling their own inventory and not marking up some other scalper's tickets. If this scalper lists another show such as U2 in Los Angeles, they would be more expensive than a Los Angeles area scalper because Gold Coast would be marking up the price compared to the scalper in California. I bought tickets from the banner on this site and I have been very happy with totaltickets.com for a few shows which I have seen recently.