I guess the price per dozen depends on where you are, other places for people to get cupcakes, your client base, how they are decorated and what your ingredients & materials cost you, plus your time, etc.
For regular-size vanilla/vanilla bean or chocolate cupcakes with a vanilla/vanilla bean or chocolate buttercream frosting, I'd probably charge $12/dozen. These are VERY PLAIN cupcakes--no filling.
If I fancied them up by making them a different flavor (or even putting in chocolate chips and chocolate chunks for a triple chocolate fantasy for example), with a filling, and with a fancier flavor for the frosting, and decorated nicely with a drizzle, candied fruit, whatever, I'd charge more, of course. Fancy schmancy cherry cuppies are a good option for charging more (use the Search feature for the recipe and ideas for decorating).
For the minis, vanilla/vanilla bean or chocolate with vanilla/vanilla bean or chocolate buttercream frosting (VERY PLAIN minis--no filling), I'd probably do $6/doz.