I'm thinking, being the only dealer of the brand in the state, means they can pick the people they want to sell the cars to. Read: cherry picking for the highest credit scores and cash in hand sales, or have really odious terms for the privilege of buying a Mazda if you're NOT in that group they prefer to sell to.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor