After putting extensive thought into the logistics of 40 boxing, I still maintain it is possible. But I don't see the point really. You would have a devil of a time leveling up and even though a single fear bomb would not do much, it would be a pain moving around - you would have to stop when a single character died. Rezzing would be difficult in BGs as graveyards change.. it basically makes all of the downsides and "wrinkles" of boxing (not that there are too many) but magnifies them and gives you little practical return. Sure, 40 players would be a power to behold. But I see little benefit over 5 or 10 man groups and a huge increase in impracticality and aggrivation. Do as you will though - you could probably 40 box these days reasonably well on 4 or 5 machines.