Here's a totally off the wall suggestion. (Coming from me, big surprise, eh?)
Along with most who have responded to this thread, I would greatly prefer a lossless format. But then again, I'm rather impatient, and would love to have some of the concerts sooner than later. Seeing as it doesn't take a great amount of technological know-how to capture the music you're presently offering, how about as a favor to those of us who want to "do the right thing" and purchase the music from you, if when you offer the concerts in a lossless format, a person who has already purchased a concert in mp3 format for $9.95, could, for a nominal fee, then legally purchase the same concert in the higher quality format? That would allow an old hippie like me to have his cake and eat it too, while not having to worry about the state of his karma, other than the damage caused by run-on sententences.