With the new salary changes, a lot of teams are now paying much more attention to their finances, and will be working much harder to maximize their revenue streams. To this end, it would be quite valuable to know how much revenue can be obtained for having an NT player, or a starter from your own country, or a home-grown player, etc. With the current "black box" approach, it's nearly impossible to decide, for example, whether it's worth continuing to train a player so that he makes the NT, if that may mean having to pay an extra $50k/week. If it were apparent how much merchandise revenue this player would bring it, these decisions could be made much more efficiently.
This could also be accomplished by making merchandising formulas more transparent, but I think simply showing the per-player income would be far more interesting.