Parents won't let me play WoW. HELP!?

no matter how hard i try, they still say no. I do chores around the house, showed them good reviews of the game, and hung out with my friends every day this summer, i even got good grades at school. and they are still weird about me playing. any good reviews, good videos, anything that could convince them to let me play. im not addicted, i spend time with my friends, all im asking is some answers on how i can convince them to let me play again