[xDramatick]

The decent ones give teenagers, and children someone to look up to. It gives them a Role Model, or an Idol for them to want to aspire to be like when they grow up. They're there to inspire people to want to be like them, and whether it's good or not, that's debatable, but they do inspire, something you can't say they don't do.

For example, I've always been big into Music/Drama, but since seeing Zac Efron on HSM, &&John Barrowman from Torchwood? These two are both my main idols, and I'd love to accomplish similar things as they have [be in a musical, a good tv show etc]. Again, whether this is a good thing is debatable, but it gives people something to look up to.

Also, it's somewhat entertaining. People LIKE to talk about other's lives, and for people who aren't socially popular, can talk about someone who's always in the public eye. Often, friends usually have similar tastes in Celebrities so it can be a good social point too.

Not to mention they make good eye candy for teenagers.