Switch to monthly?

Hey everyone, I am considering changing from my current model of charging per post in favour of switching to a monthly basis.  The reason for this is the animations are far more popular but also far more time consuming than the comics or still images. Although I still intend to continue the comic project this would allow me to focus on animation a lot more without freaking out about deadlines. Thought it best to see what people think about that before doing anything.  :)