You're making up stuff once again!It is best to have the ability to make these artilleries than not. So, only 100 K9 were ordered to just get the feel of the technology and manufacturing.
The number 100 was decided 20 years ago!! These are supposed to be part of the offensive strike corp - which is fast moving, nimble and small and enter behind the enemy lines!!
The towed guns on the other hand stay inside Indian controlled territory!