I don't mean to say that I would choose to pay more if all things were equal. Just that I wouldn't dismiss something just because it's more expensive, especially when the difference in cost doesn't contribute significantly to the overall cost of refurbishing or using the gun.
For the amateur (thats me), the extra $20-30 per gun adds up to not very much money over the course of my life. For the professional, I would think that extra cost would be easily recovered in the fee charged to the customer, most of whom wouldn't notice a difference of $30 in the overall refinish of a fine gun, especially if the finish exceeds their expectations.
Now if it's an inferior product, that's a different story.