Most valuable child DF user as a slave

[Warmmedown]

Jozu? You could buy him, feed him loads, let him become a big adult, have him become friends with another slave (or even better, a few slaves. They're family to each other) and then threaten to kill that slave if he doesn't turn himself into diamond and then cut him up or just blow him up. Yeh fucked up you may think, but the money's worth it and they should have tried harder to not get caught.

Anyone better? You could get Hancock. She can turn people into stone and you can sell them as hand-made, life-size statues. Big bucks. Nobody will know for decades that they've been scammed. It's on them anyway.

 

[Symbiote]

If Jozu is diamond how do you cut him up to sell?

 

[Warmmedown]

Seastone saw or chisel.
Or ask Kizaru to laser him.

 

[TheVocalsmith]

Smoker (He has the funny Sea Stone weapons) and hire him out as an assassin so you can get rid of other Devil Fruit user slaves... If you kill the other user's masters... they are your slaves, and now you have more than one.

and lets be honest... no human could realistically beat him in a fight