Hey cyrano, thanks for the reply. Yes 15 mics is what we need. Wireless is what we're after. Maybe I should ask a more direct question:
Can you put 15 lower-end wireless mic setups in the same vicinity without having interference issues? By lower-end I mean, the cheaper models from Shure, Sennheiser, Audio-technica, Samson Airline 77, etc.
The Samson is of particular interest since it's a compact single unit, instead of mic+bodypac. I saw Roy Hargrove playing trumpet with one of those the other day. I figure if it's good enough for Roy, it's probably good enough for me, but then again, he didn't have 15 of these on the same stage.
As for 95% or the time vs. 100%, obviously we want a system we can count on, but if 95% costs X and 100% costs 3X, I think we'd settle for 95%. I guess it also depends on what the missing 5% "looks like" or sounds like, but I don't want to belabor the point.