Vocalists/Musicians Wasting Their Talent

Since music is now much more about achieving a high publicity profile and making money than making great records, as the ascendancy of artists like Eminem (is that how you spell it?) demonstrates, I wonder if anyone has any opinions about any artists of today or the past, singing in whatever musical genre, who have consistently pursued the almighty dollar instead of maximizing their talent to sing great, memorable songs? I wonder why the recording industry continues to push artists to put out crap when SOME of them are capable of great things? Also, I wonder why artists with great talent and great power in the industry to control their own destiny continue to accept it. Examples and comments are appreciated.