I think your business venture would be far more profitable to both you and the local bands by: 1) recording stems and a rough stereo mix at the live venue, 2) offer the rough stereo mix on a memory stick for sale during the set or concert and 3) offer the band a final mix for them to sell through a website or present to prospective venues.

This sounds pretty cool.  If you are open to trade, I can build a professional website for you with a link at the bottom like "Web Design by Morrison Web Development."  I've been wanting to get into doing websites for musicians and studios, instead of the usual blogs and business sites.  
Here are links to some of my work:
http://iem.com
http://corporateenergyllc.com
http://www.whittenkitchens.com
http://steamexsc.com

I just wanted to say I am reading every response and definitely appreciate all the different insights, opinions, and ideas.  I don't know where this may lead -- possibly nowhere.  But I can have a much more intelligent conversation about it now.
 
Thanks, all.

Go for it. Just keep in mind that it's 99% perspiration. Sweat equity, as they call it in the real estate business. You've got nothing to lose but time, and let's face it, you were probably gonna waste a bunch of that anyway. Good luck!

I've never liked the idea of a flat rate for services. Most everyone around here charges by the hour. 
If I fuss about learning how to do something new, I don't charge for that, But I've never had a problem cranking out completed albums or one offs charging per hour. 
I often wondered about working remotely for clients. But then I figure the wide world of the internet is overloaded with similar services so it would be impossible to get a foot in the door. 

The plugins issue could be overcome if you were happy to get the fnal stereo mix plus a Sonar project with just bus stems.
It would mean an extra step for whoever is mixing of exporting the bus stems individually, creating a new project, Importing the bus stems and just re-mixing levels without plugs.
For best results you would still need to send the individual tracks but get back only pre-rendered busses where the effects are burnt in (albeit some effects may be on separate busses)

HI:)
 
What I can best, is classical stuff, especially voices, unplugged instruments and old school Rock/Jazz. Techno or other music like that is not my world, I'm a mixer since 1986.....so If you need someone for this kind of music, we can try:)
 
Greetz;)
Bassman.
 

Hatstand
The plugins issue could be overcome if you were happy to get the final stereo mix plus a Sonar project with just bus stems.

I don't think I'd want just a final stereo mix because the client might insist on some changes that need access to the tracks.
 
But if there were a particular VST effect that was needed for the mix at the track level, it would probably be OK to apply that effect, then bounce to a new track to preserve the effect without needing the plug-in in the final SONAR project.

Wouldn't it be simpler and more efficient just to forward on the change request to the person who did the mix? They did the mix, they know the mix. They would be the best person available to make any changes to said mix.

JohanSebatianGremlin
Wouldn't it be simpler and more efficient just to forward on the change request to the person who did the mix? They did the mix, they know the mix. They would be the best person available to make any changes to said mix.

Possibly, but the client might want to be present for the final edits.