You can't really make a judgment like that until you try to download the same song using two different Gnutella clients side by side. It may happen that none of the hosts who had that song were online at the time -- hardly the fault of Limewire.

Perhaps you have an improperly configured IP address. I do filter people who configure their IP address improperly (like using 192.168.0.1). At least I know Limewire filters that from searches; I don't know about upload requests.

Also, I share a bunch of files (some of which are unique, downloaded many times, but for some reason not shared by others), but I don't have it running all the time. So if you tried to download something I have, you'd be stuck waiting until I reactivated Limewire.

It's also possible that others are denying download requests from limewire. Who knows? All I know is I get enough out of it to satisfy me.

-A