I am going to open my mind for just a moment here -
I am obviously biased very much away from them from a sound and vocal capability perspective, but the cost of implementing devices like this is also a turn off. Seems out of proportion with the level of use they would actually get.
I have never even been to a karaoke show where I have detected Autotune being used. I have only been to one karaoke show where anything more than ech, reverb, and other minimal effects were used. The exception was a show in Hollywood ('nuff said).
For KJ's -
How many of you use Autotune or some other form of vocal DSP besides what comes built into a board? (I mean going beyond the basics of echo, delay, reverb, and a few preset things like flanging).
How many shows have you seen that leverage this stuff?
For Singers -
Is this something you look for or expect?
Does it make a difference to you when looking for a show?
I can't justify it at all right now until I either pick up nights or get another gig. But if there is enough interest I will consider adding it to the to-do list (for after I die and the business passes to my grandchildren).

-Chris