Why Didn't Everybody Buy Amy Winehouse Music Before She Died?

Why do people buy the songs of recently deceased musicians? Amy Winehouse's songs came out quite recently (compared to, say, Michael Jackson) so why do people feel the need to buy her songs...

Source: http://feeds.eonline.com/~r/eonline/answer/~3/eOJ0OssJS78/254586

Brittny Gastineau Brody Dalle Brooke Burke Brooke Burns