Amil (she's not there anymore but she was for years and never released)
DJ Clue
Foxy Brown
Freeway
Beans
Bleek
Peedi Crack
N.O.R.E.
Young Gunz

those artists couldn't go plat even with good promotion!!

Jay-Z
Kanye West

could go plat without promotion

going plat doesn't always come to those with good promotion, you need talent too! Plus songs that are catchy and pop-ee!!