Absolutely yes! Using money on account and the Wings Above Yavapai membership is the most cost-effective way to fly.
Here's why - when you purchase money on account, the purchase adds credits to your Flight Schedule Pro account to reduce the hourly rental rate.
When you fly, you consume those dollars in your Flight Schedule Pro account at the standard hourly rate.
However, if you're in Wings Above Yavapai, you are consuming those hours at the Wings Above Yavapai rate and not the standard hourly rate. Thus your flying dollar will go further.