What about flight simulators and all the different liveries? Lufthansa, Qatar Airways, Delta Airlines, Swiss, LOT, Iberia etc etc.
Who do you think who will create those time consuming textures for "1" aircraft model ???? a ghost?
There is a business for that, since hiring a texturer the price for a livery can go into xxx, here you pay just xx.
And that as example should explain why there are so many, time consuming worked out, elaborated,
and often truly complicated to create, liveries, texture sets and maps for one 3d model.
I guess you are very unexperienced in the industry, that´s why you are complaining.