Hmm. . . I just tried to count the number of retainers in our server's Battlecraft. I figure since Battlecraft is full, then (retainers in battlecraft) x (nuber of wards) should = (maximum number of retainers). Walking very slowly, and erring on the side of caution if I wasn't sure I counted a retainer yet, I counted 181 retainers. Even rounding up to 200, that only allow 3,800 retainers across all wards, or 38,000 items being sold, total, per server. This also means that if the population ever goes above ~1.9k per server, some people won't be able to set retainers at all.

Yes, I know they're about to raise the maximum, but that just (A) pushes the numbers up, and (B) re-introduces MW crashes.