On the other hand, that would require more code, and he's made plain on many occasions that he does the absolute bare minimum of development to keep ad revenue climbing - and that he's untroubled at not bothering to fix things if it isn't actively driving off users.

Plus my gut feeling says that "here's your username and password" boosts re-logins more than a token link - there's a certain "it remembers me!" to that for non-technical users, I suspect.