I do not see any comments critical of the gun or the workmanship/skill of the maker. There is a lot of wonder on the price. If you take $240,000 & divide by 6000 hours, you get $40/hr which is not high for a highly talented gunsmith. If you divide 6000 hours by 40hr/wk you get 150 weeks or 3 years with 2 weeks off per year. Thats a big investment for anyone. This leaves two very reasonable questions:
1) If we assume that this is the best contemporary flintlock in the world, is there enough difference to justify $200,000 more than a $40,000 gun (which for 99.9% might be considered "perfect")?
2) Is there a market (only takes one buyer but the one with the cash & willingness to spend it on this gun has to exist) for any contemporary gun at that price? The maker is gambling 3 years of work that it does.
My answers (yours may differ):
1) I am in the 99.9% that will never own a $40,000 gun so for me the answer is no.
2) For the builders sake, I hope so, but I would not take a 3yr gamble on it. Now if you wanted to hire me to spend 3 years on a contracted job ...........