I'm paying $1K for a CAD license because I can't write a CAD program myself. I can easily change a 0 to a 1, why should I pay $1K (or however much) for a piece

I'm paying $1K for a CAD license because I can't write a CAD program myself. I can easily change a 0 to a 1, why should I pay $1K (or however much) for a piece of software that does this?