I think a lot of times some people get excited over the whole GB idea and think "I'll start one!!", I've recently seen about 15 rise up and fall down the same week like that and usually they were the broad type GB's...
As for me I just ignore them... like I said usually they drop off the first page rather quickly so they don't get in the way too much... (except when the creator starts bumping it himself and asking why no one has joined
)
I figure a little time on the forum and they'll get their wings and think of a better subject the next time they create one...