With recording technology constantly becoming cheaper and more accessible, more and more artists are recording their albums on their own. While this can be great for driving down costs on the DIY budget and allows people to put together their music on their own schedules and in their own spaces, the "jack of all trades" DIY mentality can only go so far in some cases.
The recording industry in particular is seeing a greater and greater trend towards people recording their own material, and then hiring people to mix or master their records. While this model in itself does have some inherent flaws (perhaps to be addressed in another article), it's serving a number of artists in the independent community very well. So the first question we should perhaps answer is, "If I have Pro Tools/Logic/Reaper/Cubase/etc. on my laptop, why should I hire an outside mixer?”