Without knowing it, you may be doing the exact same thing to others: someone wants to dld a song X and runs a search for it. You have the song available and you show up in the user's search results. The user clicks dld on your file but you are already uploading to as many users as you can. The user's request for the song X is ut on hold or Queue. If you are the only one uploading, the queue number you'll see in the monitor window will also be the Waiting in Position # number, so if you only have one queue then the user will see Waiting in position 1.
Waiting in position can be irritating if you really want a file, because people generally would like to have the desired files as quick as possible (well, duh) and if you're waiting in position, you never know when the user that has your file will go offline. While this also goes of course for a file that is dlding fine, waiting for a file to start dlding only to see it gain the "Need more sources" or "Awaiting Sources" status can get a little frustrating. But, what do you want? Patience is a prerequisite for P2P.