Darkjoy wrote:
 Yes it is true, rogues are killers.
But it is assumed that at 20th level the rogue is trying to hurt Bob the evil gnome who has an incredible AC => like 30, 35 or higher which gives him a good (mediocre?) chance to live through the ordeal of 6 sneak attacks.
make bob the gnome a vampire and there is no problem ;> 
Ok not that i dont beleave you but can i get something saying that they can add Sneak attack to each attack,.