At the Etihad it was for home support, or at least the one I was watching was in the home area. I suppose Man City have grown a big fanbase very quickly and it's something they maybe started when the moved from Maine Road.
I do think it's a good idea at Brunton Park. The ground doesn't have to be intimating for fans before the game to be a fortress. Surely that's more about performing on the pitch and making noise in the stands when the game is on. Yes, I know, I know, but that's a whole different topic.
When away fans travel a long way to our ground, bringing money through the turnstiles I don't see any problem in being helpful and pleasant to them before the match. The days of jumping in a mini bus, sitting on a bear crate and piling out at an away ground in sheepskins coats is long gone and many away fans come as a family and hope for facilities that make things reasonably comfortable at the ground. . . many are disappointed!
I think there is also plenty of work meeter and greeters could do in the home end. I'm frequently asked questions about the ground, from where such and such stand is, to when the ground was built, the history of it, which bus to town centre, where can you get a taxi. Would be good to have some one official who fans can ask.