Mainly because that's depressing as hell.

Billy taunts the dog by offering a treat for a task physically impossible for dogs. Billy then gets angry at the dog for not completing this task, and pleases himself to take away the treat, and any hope the dog ever had of getting it.

Dolly has yet to realize that grandmother's don't know anything.

Jeffy offers to help his mom, but he's an idiot.

Mother attempts to save time by forcing her son to do her work, but instead wastes possibly more time by watching him do it, because she doesn't even trust her own son.

Billy makes new friends by informing them of his incompetence and rich parents.

Instead of praying for relevant things, Jeffy prays for long-dead cartoon heroes.