How would the image of Starbucks be affected if they did advertising?

It occurred to me on my commute to work that I have never seen an advertisement for Starbucks. It must have been a deliberate decision to restrict advertising. Do you think this has been a good idea? You can vent about Starbucks if you want, but I am mostly interested in the image that they have created. There is this intellectual (okay, maybe pseudo-intellectual) aura that they have, aided by their appearance in Barnes & Noble bookstores. Would this be hurt by advertising?