Culn don't require anything from any other craft prof unlike virtually everyone else. Your subcombines needed are a fraction of what other crafts need. Taking a bit of a guesstimate off of memory as to lazy to check but your average crafting item for your 30-40 red scripts a week takes from 6-10 subcombines with the rare one being maybe 5. Culn generally takes 1 maybe 2 at most subcombines. Another prof needs overall maybe 25 mats to make one item while culn about 10 mats.

So how isn't this fair? The actual work involved is about 1/3-1/4th or less for a culn item and as a result get 1/3-1/4 of the red scripts. Now you say you can't go selling your wares like other crafts maybe but food is always needing more while a crafted weapon or armor won't keep needing more.