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No, it won't cost us chakra to maintain. We would have to be expending chakra for that. This isn't expending chakra, it's literally increasing the density of the chakra inside/making up our chakra coils. You know, the place that chakra is when it's not being expended yet.To the people pointing out all the upsides of the chakra arm, I would like to point out the obvious downside to making an arm out of pure chakra: namely that you are making and sustaining an arm of pure chakra. Meaning that if Mio wants to do anything with that arm, she has to dedicate a (likely very large) portion of her chakra to creating and sustaining it. Keep in mind that Mio has all the chakra of a typical genin.
Were Mio a jinchuriki, or if Mio had a way to quickly replenish her chakra, I would be all for the chakra arm. But as is, this is likely a path to repeatedly suffering chakra exhaustion and/or being unable to use big jutsus because it will make her arm crap out.