It's expensive because the license needs to be bought for some time period. It's not pay as you go. So there is a bit big investment for every contracting period.
What is TDM (test data management)? Test Data Management (TDM) refers to the supervision and administration of enterprise architectures, methods and policies to successfully manage the value of the data and information lifecycle in-house or from outside vendor sources. TDM makes use of data sets produced to mimic actual data that is used by systems and applications developers to perform valid and rigorous system tests. True production data cannot be used for testing due to security...
It's expensive because the license needs to be bought for some time period. It's not pay as you go. So there is a bit big investment for every contracting period.