Back when I was in the Producer's Program at UCLA, a speaker came in and told us that the core of why people make and want to be a part of films boils down to one word: sex. What he meant was that everyone-either consciously or subconsciously-is drawn to movies because they are COOL. At a party, would you rather say you make toiletries or movies? It's like why people always join a band: they want to meet girls (or boys).
While I will not cop to completely agreeing with him, I will say that many people starting out in the film business seem to get drawn in and distracted by the trappings of fame. They want to be a famous actor/writer/director, but don't have the desire to do the hard work it takes to actually get to that point. Because making movies (especially low-budget indies) is not for the feint of heart. It can take years of blood, sweat, and tears to make something that's great, and hopefully commercial enough to sell. When you pile the luck it takes to become successful even with a quality product, you need to be in it 100% or you just won't make it.
Not that making a movie is a bad experience or anything! It's a once-in-a-lifetime adventure getting a movie together, and when you stand on set the first day of principal photography it is truly an amazing experience. And when your movie is a big hit and everyone showers you with accolades, you'll be the toast of the town. As you get into all the hot clubs, and the most beautiful people in the world call you a genius and want you to look at their script, you'll probably look back and realize that none of this would have been possible without all the hard work you put in when nobody knew you from Adam.
And even if all that doesn't happen, at least you'll sleep well at night knowing that you did your best and created something out of nothing. Because everybody wants to win the lotto, but really working for your success just feels better, doesn't it?