They probably do care, in that every DTEK50/60 that's sold will offset the costs of production... but I doubt they care that much in that their decision to quit making hardware has already been made.
I'm sure cgk is right and they've ordered the very minimum number of DTEK60's from TCL that TCL would allow. I've previously guessed at 50k as the production run, which might be completely wrong, but BB won't have been foolish enough to have ordered x00,000 of these. They've seen how the DTEK50 sold, have reacted by cancelling plans to put the Mercury into production, and I'm sure have few expectations for likely DTEK60 sales.
So, sales of the DTEK60 don't matter to BB except to allow them to recoup a few dollars.:)