Good point Bob about gun vs. bow. From above 30ft, I sure wouldn't want to even attempt a close-in bow shot, unless the deer was a good 15 yards away.
I don't think I've ever hunted with a platform height of more than 25ft, and my stands average probably 18-20ft to the platform.
My lowest stand location is a ladder stand wedged into and wonderfully concealed within a Red Cedar, with a platform height of about 8 feet. This location is nicknamed "Chubby Checker" (as in , "how low can you go?"). It faces a vista of higher ground, and the deer I see from it are nearly at eyeball level. Because of the exacting wind conditions necessary to hunt this location, I only sit in it one or two times per season, and some years not at all. In my only sit in CC this past season, I double-lunged a young doe at a distance of about 12 yards. She was right in front of me for several minutes, and it was really exciting to watch her, in close and at my elevation level, and never get spotted, before finally getting my chance to draw. That hunt was probably to highlight of my 2002 season.