An idea a day: 18. Sell BT seeds on ebay for music/av that is in great demand but difficult to find. You may not let others to download the file from your computer, you only know the address of the seeds, and provide a link for others to download from anyomous computers, so, in theory, you are not infringing the privacy. As music/av lover may not want to waste time for scouting if he can pay a little and get a working seed, this is a profitable business having ZERO overhead/expense.