Outside of being the unified belt holding champion- WBO, WBA, IBF and WBC- the biggest draw in boxing is being an undefeated fighter with 25 plus wins. Regardless of the ko percentage. But the wins must be somewhat substantive and well worth it.

I'd say an undefeated champion is the top draw.

Outside of that you have to have such a broad based appeal that people want to spend money to see you win or lose... Like Manny Pacqioua, who is a RARE case indeed.