As I said BB has worked for me. Before I joined BB I couldn't even sell a great name for $300. Now, I sell S**t names on BB for $3000.
It's good to see that you're having success there now, although I know it took time for you to make some sales. Since it works for you it makes sense for you to stay there, but you do yourself a disservice assuming that your experience there is typical. I suspect the overall sales rate is approaching industry standard, and on an average $2.5K sale your're paying approximately 35% commissions when you include the logo fee, which is around twice the industry standard. So for at least some sellers it makes sense not to stay on the BB platform.
Some of the changes I've seen over the last few years on BB:
* A couple of years ago all my sales there were at the listed price, while nowadays I get many requests from BB sales reps for discounts (which mostly come to nothing);
* Continued expansion of inventory levels has seen accompanies by decreases in overall sales %'s;
* I'm not aware of any new marketing activity or campaigns on their part, and in fact I don't believe they've announced anything in this department for a very long time;
* They are now less transparent with sellers than ever, and the move to Slack was a very clever move given that the free version of Slack only retains the last 10K messages so basically history there deletes itself. In fairness they got the discussion out of the public view (here) and into a private community (Slack), so from a business perspective this was a good move;
* Their narrow focus on brands is starting to get diluted with the addition of more generic names which many sellers would not consider to be brandable domains;
I think the industry as a whole, including brandables, is down this year. Perhaps the bumper sales year of 2015 lulled many domainers into a false state of overoptimism about how healthy the industry was.
FWIW I still admire what BB have done from a business perspective, and perhaps with hindsight I might even accept some of their practices as being good business decisions, albeit not in the best interests of sellers. But I'm afraid the gloss has dimmed significantly at this stage, at least for this seller.
YMMV of course.