Right. Though I don't love it, I think there's value in the idea of retention. And at the end of the day I always like the idea of giving GMs more tools rather than less--even if they are a little complex. (We don't need no training wheels, and it's fine to make mistakes...just have fun doing it!) Understanding Cap Space is a skill, after all. It's not exactly rocket science, but it's a little wonky if you're thinking about it just as "I'm paying this guy's salary."
If you trade a player and some cash, you're paying the guy's salary for as long as that cash lasts.
If you trade a player and retention, you're sending the receiving team that much extra cap space, _and_ paying a chunk of the guy's salary for the duration of the guy's contract.
Retention alone, then, is worth considerably more return on investment.
