Home recordings are getting better these days, so sometimes mixing your home recording makes sense. This is particularly useful for programmed EDM and hip-hop/r&b genres as all the music is generally made inside the computer anyway.
A set of experienced ears and a bunch of really great outboard gear and can a huge difference to the overall balance and impact of this kind of music.
If you’ve recorded live instruments at home like guitars or drums, there will be a limit as to how much we can improve the sound – but it will still be starkly better than mixing at home with inexperienced ears.