Well I wouldn't say Naperville is very affluent. Don't get me wrong, the average household has no problem supersizing that next Mikey D's run, it's certainly not one of Chicago's upper crust burbs.
When I just scanned the link and saw wealthy Chicago Suburb my mind immediately wandered to Lake Forest, Glencoe, Kenilworth, and Winnetka. If anyone of those took in migrants, all hell would have broken loose!!!
Data is always better than conjecture, so here you go:
The average Naperville home value is $525,236.
The average Lake Forest home value is $998,257.