People have always looked up to others for inspiration and motivation. Even those who have obtained fame and fortune admired others early on before they "arrived".
Just knowing someone else has accomplished (their) dream makes them believe it's possible that they too can breakthrough.
Having said that there are millions of people who aren't pursing any worthwhile goals and get their delight from watching their favorite celebrities collect awards, accolades, amass wealth, fall in and out of love....etc
They take pride in knowing the most about the least known facts about their idols. It's been said the word "fan" is short for (fanatical).
Can "stalker" be far behind? :)