Not really. I joined one just to see what it was like. All I had to do was show up in an IRC channel and go through some 'testing process.' Apparently if I was referred by someone I could have forgone that process. My 'membership' recently lapsed because I never used it, but it wasn't hard to get in.

They did have some onerous rules though. Like getting kicked out if someone you referred breaks a rule. I think you even got kicked out if someone referred by a person that you referred got kicked out.

> They have very strict sharing requirements (you have to contribute not just leech).

The problem being that there are many torrents with only seeders connected to them. So it would be hard to keep your 'quota' without a concerted effort. It's not just 'leave your torrent client open when the downloading finishes.'