As the saying goes " Your mileage may vary"
For every 10,000 shooters there is one (1) muzzle loader, and that is divided in two, with the fact of in---e ( unmentionable ) shooters.
Obtaining( for a bargain price ) a muzzle loader by a well known maker, can be an edge on resale. But often times the new byer does not know who Joe Smuck is, and they don't care. "Cuz" they can buy one just like it at Walmart for $200. And it is new!
Making one for yourself is self rewarding in it's self, if it is better than Taylor's, Rich's, or Jim's, premium.
I'm sure the next pair of socks that I knit won't be worth much ( I don't knit ), but they will be keepers since "I" made them.
And that is the attitude you must have.
Just to note, there have been some new students ( here )of the art of making traditional muzzle loading rifles that are amazing.
So what is holding you back?
Fred