Speculation from DailyKos
[link|http://www.dailykos.com/comments/2005/9/26/184830/683/194#194|Here:]
...."they kept his salary to give him an incentive to stay loyal and take the blame quietly like a good boy, and since he can't find a job they're looking for excuses to continue paying him for a while, hence his new role to 'advise' FEMA on the assessment of the response to katrina."
Tom Sinclair
No enemies had ever taken Ankh-Morpork. Well *technically* they had, quite
often; the city welcomed free-spending barbarian invaders, but somehow the
puzzled raiders found, after a few days, that they didn't own their horses
any more, and within a couple of months they were just another minority
group with its own graffiti and food shops.
-- (Terry Pratchett, Eric)