ray_afraid said:
Would explain why Watto was much more willing to give up the boy. His mom was the money maker. Otherwise you'd think he'd rather keep the younger one who would live longer, become physically stronger and therefore do more work.
Watto wanted to wager Shmi. Qui-Gon wanted the boy and Watto wanted to roll for it (probably with loaded dice). Qui Jedied the dice during the roll and Watto was pissed.