The problem would be that you would be responsible for ensuring that nothing illegal happened with the copies made. If you do it yourself, for yourself, that's a fair use. If you make the copy and then sell it, then you're in trouble. Sadly, apparently the same goes for recording venues. Even if you do nothing except let them have access to equipment, it makes you an accessory if they run off and do something stupid with their copies.

Not that I have any legal basis for any of the above... it's just a discussion I had with a friend who ran a music store as well.

M