1. to be powerful. Being powerful makes them able to consume more, hence being more happy. People do everything to be more comfortable.
2. to solve peoples problems, make the world better place = to feed their internal ego, prove the world that he/she can be helpful. This is a subliminal instinct of humanbeing having the main goal is being powerful among other species. Being powerful - see point 1.
3. to make money. Having more money makes people able to consume more, without any problems.
Aren't there any producer without a goal gaining power to consume more? I don't know, maybe. Don't we always say that if we want people use our products first we should ask ourselves would I use it? If yes, this means you are a producer, because you made a problem-solving product. But this also means you are a consumer, because you would like to use it. Mark uses facebook. Is he a producer or consumer?
Do you know any producer that don't consume 100 times more than avarage consumers?!