i personally wouldnt abuse it as it sobviously not meant for players and as such deemed an exploit, as to banning everyone in guild thats just silliness.
Having ,in a past life, losing a job due to me NOT revealing that someone was stealing (not me btw) and taking them to the cleaners for it i assume that is the reasoning behind this, i.e. guildies must have known so are guilty by assosciation.
but its WOW so i dont care