Come on, Yahoo also provides many other services, like YA, mail, News. Search engine is not all Yahoo can do.
I can not say why people do, but I can say what I generally do. Sometimes google could not able to satisfy me. In that cases I have to depend on something and that is yahoo.
maybe because they are used into it. they're more comfortable using yahoo since yahoo is older than google. they are a loyal users of yahoo i thought
Yahoo still offers some ok features. I've gained a lot of customers through Yahoo Answers before. Some people like the simplicity and may have been using it for years now, so just seem to stick with it. Some people hate change...