have you ever been adicted/dependant to anything - if not i'd respectfully suggest that you havent got a clue what you're talking about.
addicts (to whatever) can get clean but it isnt as simple as just 'stopping whenever you want' - it depends very much on your lifestyle, support network, family etc - and although amy winehouse had plenty of money - in every otherway her support network sucked - her husband was/is another addict, probably a lot of people arround her were too, and the music buisness is a real party lifestyle , so in order to break the habit she'd probably have had to quit the only thing she'd been any good at.
and i'm not putting her on a pedestal - I personally can't stand the kareoke greif that ensues whenever a famous person dies , but while she was in no way perfect she also wasnt evil incarnate ,- she was just a flawed person (like 99% of the rest of us if we are honest - leaving aside the few who believe they are perfect) who at the end of the day couldnt make it.