Instead of asking why more in the west, don't
travel to the east for rides, maybe you should start with, why some from the
east, will travel to the west for a ride. Then see if those reasons could
be swapped, to have more travel "east" to a ride.
And, as far as a NC ride, many of us are not ones
to "race", so riding the NC is just another ride. If the ride was offered in a
way that had spectacular scenery, a tough, but doable challenge, and was not
someplace that I could normally ride, I'd maybe consider one. But it has
to offer me something extra special to attend as a rider who just rides to
finish, towards the back of the back.