OP, which bosses are you talking about? I'm genuinely curious, not because I doubt you. I've only seen this happen in AK, and it was only once and was some inane ridiculous, unneeded thing that I don't think many groups knew about (and something I've already reported).

Edit:
Miley, I'm pretty sure he's referring to the Salvage bans. You know, that massive ban set that completely demolished some endgame linkshells?