I'm 6' 1" and my platter is 51" above the floor. I find this very convenient for cueing, stylus examination, record sweeping, etc. Also, even though it (thankfully) is not done on a regular basis, when I do a cartridge install/alignment it is beneficial not needing to bend over so much. I've become spoiled by the convenience of this height and would not want to go back to anything much lower.
Some might be concerned about stability of a rack with such a high shelf but my shelf is wall mounted so no worries there. Then I have a modest sized sand box on the shelf with the table on that.