Allowing all sites access

[Andrew Ducker]

Brad Fitzpatrick wrote:
> Sure, that's up to your identity server to give you that option.
> 
> If I made it available on LiveJournal, it'd be a hidden (console-only)
> option, not available in the UI for users to accidentally click.

I'm just wondering _why_.  What's the possible drawback?  I've been 
wracking my brain half the day and I can't think of a situation where it 
could be used against me.

Andy D