They use the dogs for protection. They let them roam their environs or territory and woe betide any innocent child who gets in the way.
Also, some use them as entertainment, to fight OTHER pit bulls...and they gamble on the outcome. Cockfighting, only with pit bulls against each other. I never saw any of those dogs...they would have had some scars. The ones I saw were VERY well-kept dogs.
Errrr....yes. That is why they are called "Pit Bulls", they were breed to fight in the pit.