If you already have a bike, then just fly it. That rate sounds about right.
It cost $900/bike from Panama to Colombia in 2011.
It cost $1400/bike from Vancouver to South Korea last year.
As has already been pointe4d out, bikes in Colombia are expensive. It may be cheaper to just bite the bullet and fly one in. At least that way you woukd know the bike and have it packed before starting.
Sea freight would be cheaper (probably) but it takes longer. Or, if you have time, why not ride it all the way down ? :-)
Or, go the other way, buy one in Chile.
Did I mention I have a Funduro for sale in Chile ? :-)