I never put cupcakes (or cake either) in the fridge. Refrigeration drys out cake. It's a terrible way to treat nice baked goods.
I never notice any dryness from my refrigerated cakes or cupcakes, but I will start leaving them out. Is it okay to leave them out in hot, humid environments? Do you leave cream cheese frosted ones out too? Would you leave items like key lime pie out too?
I hear a lot of people talking about freezing their baked goods and that sounds stranger to me than keeping them in the fridge, but I'm willing to learn new things and try new ways.