Figure out the cost difference from a 440-1 top end to a B-1 top end. IMO any 572 street combo should have more than a stealth/ edelbrock cylinder head on it, but i guess it all depends on what the end user can afford to spend and how much power they can afford to give up.
The B-1 head as cast is not what i would consider huge by any stretch, but even in unported form they will work very well on a street brawler with good overall power and torque without having to rev it to the moon. B-1's are a good cylinder head, but in the world of cylinder heads they are antiques compared to what other brands have available. There's only just so much you can do with a 4.8 bore space though.
finally, I would agree that the marketing of the B-1 heads is lacking. ported Edelbrocks or stealths are too small for even a 500" combo to make any real power with, but they will make okay torque with the smallish runners/ cross section.