I think perhaps if we properly defined setup then there'll be a clearer discussion.

You've obviously had a good run. I think if there were more twin carbed DCOE,DHLA,PHH then places can afford to be cheaper but when you get a handful in over the year then perhaps that's reason enough to charge more. After all there are a million EFI models lined up that they would prefer to tune via hand-piece PC and cables.

Most people buy two DCOE carbs on their own thinking they are cheaper. They don't realise the additional costs of manifolds, filters, soft-mounts, linkages, jetting etc.

Just be aware of the additional costs, because on top of those costs are the tuning costs as mentioned above.