Can anyone say when Oracle is justified? When the ERP application you are installing has in it's specs - Supported database: Oracle I am sure a crack Postgre

Can anyone say when Oracle is justified? When the ERP application you are installing has in it's specs - Supported database: Oracle I am sure a crack Postgres guy can bash and file that sucker to work. But the vendor will not support the result, and some places, some situations, that really counts for a great deal.