What sense does it make to mime a song for a radio concert?

They could also just play the original album version, it´d be the same.
In germany tv all (well, most of all) songs are mimed, at the risk of hitting a wrong note or just because the full musical equipment couldnt be taken to the studio, I´m quite sure that I saw him miming DIST twice on german tv. (Wetten dass, and some VIVA thing)