Data obviously shows the advertisers that those they want to reach, read said publications so their advertisements are not out of place. It may elicit certain reactions in their non target audience (jealousy is what I am reading), but it is of no concern to them.
“why cant you advertise in goyish publications that serve and are catered specifically for the rich and wealthy people.”
Not sure how many non jewish rich and wealthy are interested in spending Pesach in the Swiss Alps or in buying the latest and greatest shtreimel or sheitel, even if it is top of the line at 4 grand a pop and 30% off.