Surface - Race the night was, as far as I know, actually recorded live with half a dozen fans in attendance, then Long-Beach-Arena crowd noises added to it - exactly the same case of A II Z's "The Witch of Berkeley", or so someone said to me, I can't really remember.
I guess live albums make sense if they offer something that goes beyond the studio vrs. "Unleashed in the East" is perhaps my favorite album from Judas Priest, and I sincerely couldn't care less if it was 'enhanced' in studio. Take UFO's "Doctor Doctor" or "Rock Bottom", for instance - both sound WAY better in the "Strangers of the Night" vrs than the original studio recordings on "Phenomenon". Some bands are at their best upon a stage, and sometimes a live recording really capture it. And sometimes a one-take recording really works for the best - would Taurus "Paper Chaser" be any better with a proper production than it was live-in-the-studio for BBC?
You know that I see in your eyes - Blind Fury!