Doubt anyone farms Highkeep nowadays. Maybe if it was a blessed zone there would be people there but even still, the odds of a BBoT dropping are pretty small.
Seems like it would be, it's very surprising that the gear there is primarily non-level restricted. Considering how good it is, did it just get over-looked when rec levels were added?
In any case, I'm sure I cant afford one, but I would sure like one for my rogue.
I think that was due to the fact that a) the mob is on a longish respawn b) not too easy to kill and c) the blade itself is rare.