When to sell your fantasy keepers

It's full-blown fantasy draft madness this weekend, and those of us taking part in keeper leagues have our eyes focused clearly on the younger sleeper players we can secure in the latter rounds of drafts or on the cheap in auction leagues. However, depending on your format, you may already have your hands on a superstar like Calvin Johnson or Adrian Peterson, both of whom are in their primes. Savvy keeper owners know that we must cut bait on the elite players before their value diminishes, though.