Making movies is very profitable.I love how you just throw that out blithely as if it were a well-established fact. In fact, the odds of a given film turning a profit are about 1 in 30. For a detailed examination of the economics of the film industry, I recommend the book Open Wide. For a brief introduction, try this: http://www.baselineintel.com/research-wrap?detail/C8/what_ar... and other articles on this site.
Now, part of this is skewed by the fact that many films are just bad. Not so bad they're good, so bad they're bad - incomprehensible dialog, blurry photography, murky lighting. Let's dismiss 2/3 of films as bad - that's excessive, but let's be harsh. So about 1/10 of the remaining films can make money. Half of those lack commercial elements, they're competent but terribly dull and hard to sell. Of the 5 films you have left that are competently made and have potential commercial appeal, one will sell. There's a <1% chance it will be a hit; more likely it will eventually recoup its costs via foreign sales (as a sweetener in a package) or from rental income via Netflix or the like. That takes about 5 years.
That's indie films. Big studio films tend to lose money more often than not as well. I am on first name terms with one billionaire who writes a single check to pay for all the costs of a big famous film you probably saw 4 or 5 times a year (I would prefer not to mention names). 4/5 of those films lose money despite stars, critical acclaim, excellent technical elements, and a great story. Eventually, most of them will break even - that's why you cast stars, you can extrapolate sales with reasonable accuracy once you know the opening data. But the financial destiny of most films is to offset tax liability for the small number of films that do make bank.
I own a financial interest in a number of the films I've worked on. I keep the documentation mainly for souvenir value, but I have zero expectation of ever seeing a penny from them. I find it amusing but also frustrating when you roll in here and tell me how profitable it is.