Got into a bit of an arguement on another forum.
Produced this graph to back up my lens pricing.
Thought you might like to see it as well.
The blue dots are the following data taken from B&H
The Red dots are the estimated prices for new lenses based on the regressed equation of the data.
B&H $ (L/f) Lens
1049 ( 36) 100mm f2.8L IS
5999 ( 100) EF-200 f2L IS
7249 ( 107) EF-300 f2.8L IS II
11499 (143) EF-400 f2.8L IS II
10499 (125) EF-500 f4L IS II
12999 (150) EF-600 f4L IS II
13899 (143) EF-800 f5.6L IS