Because after seeing the unmitigated garbage it's become, you'll never want to go back. It seems the gradual process of Slate becoming a right-wing nuthouse has blossomed. Check out the headlines adorning the homepage. You'll find William Saletan's left-bashing article called "Democrats Aren't Nice People" (where he proceeds to brazenly plagarize the title of Al Franken's book). Right under that is a pretty nasty review of "K Street" called (here comes that word again) "Liars In Love." Then float your cursor over "Campaign 2004" and gag at what's there.
Farewell, Slate. It's been nice knowing you.
