To monetize, first find your market. Then figure out what this market wants (need is irrelevant)
If its premade gcode - go for it.
Gcode is not a definite set of instructions, it is a result of choices covering machine/operator tolerance, bit size, run-out, system requirments (Post processor tailered towards the intended CNC-machine), quality level, time consumption etc.
If you provide a machining code do you provide a satisfaction/production/useability guarantee?