Why? Because she's ugly and a mentally fucked now?
Winehouse may be a crackhead, but unlike Rihanna and all the other "popstars" she actually can sing, writes her own music, and is 100% behind the creative process for her songs.
Her music is much more hip hop than almost every other popstars, I mean her last which won 5 grammys and is one the best albums of the decade was entirely produced by Salaam Remi and Mark Ronson, two names that are deeply involved in hip hop history.
Winehouse is the white Lauryn Hill. She's crazy dope.