I think there is interest for cards that are flawless, but BGS seems to have their issues (probably moreso than PSA), and consistency is very important, particularly with something such as a black label. This why you’ll continue hearing about buying the card, not the grade (as to judge it yourself)
You should take a look at this!
www.elitefourum.com/t/bgs-black-label-speculation-rumour/23488/1
Anyway, I think the concept is very nice, for the absolute best condition cards, and the eye appeal of the black label (with the subgrades).