Ok cool, I might look into it later. Is it a one time price or do you have to pay every month?
It's a one time thing.
They make more money by releasing assets in the form of DLC, that you can buy & use in your projects. (Music, animations & graphics.)
They also have a free trial version on their website.
http://www.rpgmakerweb.com/products/programs/rpg-maker-mv