This BusinessWeek article on Mexican microlending and a newspaper note I bumped into detailing the growth of luxury brands in Mexico made me wonder on whether it is ethically sound to sell high-ticket products to a consumer if said person can't afford it.

On one side you have the free will of your customer, on the other the fact that you may knowingly sell them something that will cause them more trouble than enjoyment.  I'm all for giving all the necessary information to the consumer, but he/she has to take their decisions independently.