This partiular piece has a very limited customer base. The customer must be a Marine, and must like scroll work, and must be where you were selling last week, and must like the price. Apparantly, you had a customer with all those things, plus a 'financial advisor' with a different opinion.
The point I am trying to make is, just because someone doesn't buy because they feel the price is too high doesn't mean the item is overpriced. After all, there was a husband there who felt it was not overpriced.
Here is a great opportunity for you to grab one of your business cards, write on the back "christmas list Marine plaque" and hand it to the customer with a smile. Everybody needs suggestions for their family for Christmas and nobody has a list. My guess is that he will end up with your work on his wall if he truely did like it.
P.S. Never consider your hours and materials in pricing. Always consider your hours and materials in figuring profit. (The price is always "what ever the market will bear")