Because most people do not have enough friends, and start thinking of actors that they see on tv everyday as their personal friends, someone familiar to relate to.... or simply because they wish they were as popular, good looking and rich as those actors; so they see their own wishful thinking reflection on those people.
Me, personally, I don't give a crap. I hate tv, and the only actors I really like are the old big guys (Sean Connery, etc.)... and I like them because they are good at what they do (and I admire talent in any field), not because of their looks or money.
Heck, I wish I had those big dollars, but I know I won't!
