"Because implementing an Idea is most of the time harder than having an Idea"
I think the difficulty is not in the hacking skills, though. Therefore it seems to me the arrogance of hackers is unwarranted. While I have a science degree, I taught myself programming with a couple of books - it really is not a secret superpower that should make the rest of mankind bow down before me. It is a skill like any other.
Personally, I would be delighted to meet a business person who is dedicated to making an idea a reality.
There might be an issue of trust: typically, business people are perceived as the people who screw things up and make life bad for the programmers. Therefore, just bumping into a random business person, a hackers enthusiasm might be limited.
Another thing that sucks about hacker arrogance: most hackers really only want to work on their own ideas. That makes finding co-founders very difficult. Last year I really tried to meet eligible candidates (ie on barcamps), but even though I met a few capable people whom I also liked, finding common ideas and visions was too unlikely in the end. Of course, I myself am no exception, I would also prefer to work on my own ideas. I try to be open for other ideas, but still.