Sarah Hoyt isn't a big seller in the chain I work for, but 0 sales isn't plausible. Throw in the rest of the MGC and it's impossible.

I suspect that Baen is trying to cut back on the costs of inventoring and reporting items and accounting for sales, and the result is neglectful under-reporting that is indistinguishable from deliberate rip-off. I lean towards that theory simply because it's such a common form of corporate misdoing.