"Every country gets the circus it deserves. Spain gets bullfights. Italy gets the Catholic Church. America gets Hollywood."--Erica Jong

Start thinking of your personal mailing list as a publicity announcement list.  And get everybody else's list you know as well.  I would hope this doesn't seem too self-serving.  A good mailing list, after all, will get the word out and might--everyone hopes--generate some sales.  The sales are minimal, however, in relation to the invaluable word of mouth.  People simply need to know that you've published a book.  Don't forget local bookstores.
The publisher will also spend some money on advertising, though how much money is always a difficult subject.  The publisher wants to get the word out because the book needs to sell, but advertising costs a pretty fair amount of money.  A publisher has to balance these variables and will ultimately do what is best for the press.  You might want to advocate for yourself with the publisher regarding publicity, if just a little.  It won't hurt.