Of course, when I say madness I'm not inferring that it makes no financial sense, it is just astounding how rapidly and consistently Emirates have grown over the years. I would also assume that you mean they are the number 1 choice going eastbound, given that LGW-DXB-LAX isn't a particularly desirable routing (though I'm sure some tight-arse has done it for the sake of saving a few quid!).
Or maybe some people also like to spend some time in DXB and Dubai before their connecting flight? Just a thought...