Because its not a factory. Its a dad and his daughter running a little gunsmith shop in Missouri, USA. Quickly modifying CZ guns and turning them over at low margins branded as the "CZ custom shop" via triple river gunsmithing. This is not a bespoke gunmaker making them one at a time, its a modification service to put a non-production caliber into the chassis of a $1000 gun. Add some pretty $800 wood, a decent $500 barrel, a $300 bluing, and you have $2600 wrapped up before covering parts and other labor, liability insurance and freight.
If CZ was making them by the 10,000 lot, all alike, off a conveyor belt in a large manufacturing facility things would be better. There is no such demand. So they are cobbled together in small numbers. But hey, they are$2600-$3500. If you want a real custom gun they cost over $10,000 and they do feed right as they are given hundreds of hours more attention to detail. That being said, there is no market. I have a $10,000 custom DG rifle unused for sale and no one will pay less than half of what it cost as almost nobody is spending $4700 for a custom gun these days.
So if $2600 is your budget, you're going to get a lousy gun. It's saving grace is that it can be worked over into a very reliable $3000 gun. It's that last $400 of do-over work that gets everybody's undies in a bunch. In the end, the gun you got for what you paid was a decent value.