How about an ad (assuming an honest product, since this thread is clearly about ads as such) in a remote village saying "get a work visa to Europe/US, you could live like these people with higher living standards!"

People who were quite happy being subsistence farmers are now aware, or much more aware, of the possibility of higher living standards. Doesn't seem immoral to me. Why would a car ad be immoral then? Perhaps it will improve the average purchasers life? I say it someone who is quite happy with a 15yo Honda Fit :)