The primary reason a company needs an ISO certification is that it is mandatory by law or contract. The secondary reasons to conform to the standards are :
It gives an organization a platform that is recognized by game changers and decision makers.
Identification of recurrent issues and resolving them saves valuable time and financial support.
Processes become more efficient which improves the system.
They give a company a competitive edge needed during contract tenders
The same resources lead to more value and worth.