Members can be suspended or banned for breaking YorkieTalk's Guidelines, (
http://www.yorkietalk.com/forums/showthread.php?t=1996) which apply to every member. Once banned, members are not welcome to come back or use YT.
The vast majority of members cause no problems and will never be suspended nor banned. But we do have to watch the community a bit to make sure that YT is friendly and informative, and not flooded with spam or personal attacks.