Why does a search result even show up if the file won't even be accessable to you?

For example, I found a search result of some video from my favorite football team, and it just says "waiting for busy hosts"

If there is not enough sources to download the file, why does it even show up on the search results?

And if only one person in the network has the file, is there a way to ask him/her for it directly?

Which brings me to this point, I created a video file on my computer. I then put it in my shared folder, knowing that I am the only person with that file, yet someone uploaded it.... Why did they not get a "not enough sources" message?

Any help is greatly appreciated!!!!!