They actually do not advertise at all. The ads you're talking about could be the Viva Glam ads with Mary J, Elton John etc. - of which all proceeds go to charity. Other than that they really don't advertise - you'll see stuff in Allure and whatever, like good stuff to buy, nice new colors etc. and MAC will be there along with all the other lines, but they don't do that advertising - those are picks by whoever!
Right? :\