[AusNOG] Bogon Filtering

[Mark Newton]

On Mon, Feb 13, 2012 at 04:38:52PM +1100, Chris Kawchuk wrote:

 > IMHO - It's best to keep them, as long as you keep your lists
 > up-to-date. However, If a provider simply cannot be bothered
 > (i.e. doesn't watch the announce lists),  then sure, they can
 > accept 0.0.0.0/0 orlonger; but they do so at their own peril.

What exactly does, "at their own peril" mean?  

What "peril" awaits a network operator who accepts announcements
for address space that would otherwise be idle?  Can you quantify
it?

  - mark