If you often make many more than the 50 post maximum, and there is an open spot, I don't see why DS would not be willing to give you a second spot, so that you would be eligible for payment from 100 posts/week, provided the additional 50 posts you make each week have been consistently better than other applicants who were applying for open spots.
The thing is that when Loycev makes 50+x posts, those x posts will most likely be on the same boards and topic he already posted that week.
To maximize the exposure of the cm ad, and the efficiency of their investment, it will be much better to hire different people that will post elsewhere. Even Loyce, who writes all day here, has some posting habits, favorite boards and subjects...