I noticed this also, so I changed my settings so that no freeloaders could download of me and inorder not to be a freeloader you must share over 250 files.

Problem sloved...

In theory this would also help with your 'paranoid' thoughts, as the RIAA or whoever may try to use everyone uploads slots, are not going share over 250 files thus unable to download of you!

I would not consider myself a 'heavy' downloader and still manage to share over 1500 files so I feel 250 is a reasonable amount...