If the advertiser gets three people to purchase from the luxurious ad, the ad more than paid itself over already. So when you see an ad for that Caribbean Cruise with Kosher L’Pesach food, the sponsor needs only a tiny number of buyers for the ad to be worthwhile, while thousands of other readers might assume there is widespread luxurious wealth when in reality only a tiny number of people actually buy these luxurious advertised stuff (cruise, hotel, watch, etc.)
So this idea there is widespread luxurious consumption within the frum community is baloney. It’s all just a bunch of advertising for a tiny number of buyers.