It seems to me that mixing projects come in three flavors:
1) Get raw tracks and mix them as you see fit, applying your own musical sensibilities
2) Get raw tracks and mix them using a rough mix from the band as a reference/guide
3) Get the actual full DAW session and use that as starting point to clean it up, tweak it, etc.
You can use your favorite DAW and plug-ins for options 1 and 2, but what about option 3? How common is it for a potential client to ask you to basically just finish the mix they started? You would need to own (and know how to use) most popular DAWs and have a massive library of plug-ins. I've seen multiple mentions of these types of projects recently on podcasts and videos (including our own @Kevin McCloskey).
Maybe this is more common for people working with clients signed to labels, not folks just getting started with self-producing artists. Thoughts?
I guess the practical answer is to buy stuff as business needs present themselves. I'm a Windows guy, so the first Logic or Pro Tools project that I really want to do will cost me at least a couple grand to get a decent Mac mini. And the DAW software. And the plug-ins. And a KVM to switch between Win/Mac.
Garry