Selling ads is Google's bread and butter, but buying them is not its cup of tea

SAN FRANCISCO -- Like a gourmet chef who rarely eats out, Google Inc. feeds advertising services to hordes of other businesses while skimping on its own marketing. The recipe has been extremely fruitful. While the Internet search leader has sold more than $30 billion in advertising since 2001, Google has become a household name without buying expensive ad campaigns on television or radio or in ...