My point is- With the other brands, you're paying for an ETA 2892 with DD module to get a 2894; in AP's case, you're paying more for either the JLC base, or for the AP in house caliber. It's not an apples to apples comparison. The only constant is the non-integrated module based chrono add on. However, AP is producing their own movements; just not the full stretch with their chronographs as of yet (they're still using the FP1185 in the 25860).
One's perception of worth is subjective, however there is a little more cost justification with an in-house base. As a basis, a new, off the shelf 15300 Royal Oak with the 15300 is around $12,500 MSRP on it's own. Is the ROO case, module add on and other differences worth the extra premium? Obviously, there is a market willing to shell out the cash for it...