When they get stuck at 0 kb/s?? Why?

I've looked at my Monitor and seen all uploads sitting at 0. If I kill them, I see them log back on (or new one's) and they start back up again. Actually uploading.

I hate to sit and stare at my download going at a whopping speed of 0kb/s. (no, I don't literally sit there and stare at it! ) I would prefer if the other user would kill the upload. Let me try it again or find another host without re-searching.

Please, please, please explain to me how it hurts the network...

It would seem to me that letting them sit at 0 would hurt the network. Others can't download from me if my upload slots are filled up with non-uploading users.

(I'm certainly not trying to sound nasty, if that's how this comes across. I'm genuinely interested. I don't fully understand the workings of Gnutella and what hurts it / helps it.)