The last Aoc I submit for someone 2 different twins on it airwork / charter was estimated by casa as costing 8000. 6 weeks later ops manual approved all right to go and casa gave a refund of 1300.
Costs don't depend on how good and clear your ops manual is because every FOI has a different opinion as to what a good ops manual is. I can submit 2 identical ops manual to 2 different inspectors and get 2 different answers. After a while you get to remember what inspectors like to see what.
People selling a company with an aoc attached seem to think there is some kind of premium because it's ready to go. The problem is there are too many people outthere still paying stupid amount for them.