For example; Chavez Jr. was born rich but I wouldn't consider him a great fighter.
Any names?
Rich people do not need to fight professionally, so most don't. Boxing is a poor mans sport. Wlad and Vitali had doctorate's prior to becoming professional boxers, so I would assume they were doing pretty well without boxing.
Ike Quartey?
Sugar Ray Leonard was from good stock...
eric morales
marco antonio morales
possibly james corbett too.
Just guessing, but, my guess would be Max Baer, Sr.
hmm
@Maurice: Morales was dirt poor.
I have a feeling Canelo was relatively comfortable and of course Chavez Jnr. Dunno who else.