My CO Silver Elite status is worth probably $1500 or more a year to me.
Why?
1) 18/20 FC upgrades, that I would NEVER pay for.
2) Priority Check-in. This is HUGE when the airoprt is busy. I value my time at no less than $50 an hour, so if I am save an hour on a round-trip, that's worth $50 to me.
3) Bonus miles give me essentially a free ticket a year ($400 value).