No, this is a myth. Some performers do get caught up in materialism and greed, but that is the choice they make, and has nothing to do with any demons or devils.
No, 50Cent did not sell his soul to the devil.
This is one of the silliest questions on this whole site.
Yes, yes he did sell his soul.
No.
No.
No.
No.
No.
No.
No.
No.
No.
No.
No.