I see the need for customers to know if an author is active or not. After all, if I found one of Gypsy's articles, say her classic dog-humping article

In fact, I know that this same thing happened to a BIG customer recently. He had requested an article privately to someone, I don't know who, and didn't hear back promptly. So this is an issue. The main thing isn't so much which writers are getting recognized but rather this - is the customer being served? Without customers it doesn't matter if your name is Word Gypsy, Celeste Stewart, or Joe Blow.
Maybe restrict those who can accept private requests to those who have demonstrated some sort of recent activitity? Maybe have a form that each writer fills in and can edit in their account area saying "currently available for private requests" or "not accepting new clients at this time" (really? I don't know. It's late and I'm tired.)