Brothers blooming?

Why do stars act in low-budget movies? Answers on a postcard, but here are a few suggestions:

• The stories are less formulaic, so the parts are more interesting?
• The opportunity to play someone different, to go in a new direction?
• The chance to participate in the movie's profit?
• The convenience of seeing your family, as locations would of necessity be cheap?
• The slim chance of being in the next independent classic, with higher probability of being considered by Uncle Oscar and/or the Sundance Kid?
• The opportunity of working with directorial and writing talent not yet sucked into the corporate Hollywood machine?

Perhaps all of the above? The Brothers Bloom ticks most of these bullet points.

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