Thank you for answering : ) I will try to clarify what I was first aiming at when I asked HN...
1. Let's put it that way, with a completely made-up example. Suppose that I am an engineer (of whatever field you prefer) with some amount of money, an appetite for learning and after 5-10 years of working, I have failed to find a suitable business opportunity. I could go around and ask every business I know about problems that they have, but I would like to find a way to make this faster - to gain knowledge about relevant problems in an efficient way. What should I do?
2. Well that is a problem ; ) Would there be a way to bring more problems to light, then? To solve more of them? What prevents people from sharing these problems?