I don't support the addition of cash transfers in deals, because I believe that it furthers the advantage of the big market teams. I searched for the MLB rule on cash limits, but there doesn't appear to be a hard and fast one. During the Bowie Kuuhn era, I faintly recall that the limit was $1 million. I know there is still a low threshold of this in real life, because the vast majority of deals involve trading 1 bad contract for another. For example, the Milton Bradley for Carlos Silva deal may have involved about $5 million.