Offer a cheaper version of AD Domain Services for testing / ALM scenarios
The price for AD Domain services is justifiable for a production environment but is high for ALM environments (dev, QA, etc.). In certain scenarios separate AD domains for non production ALM environments are required. But at the current rates it is cheaper to use a Azure VM as a domain controller than using AD domain services. I think if Azure offers a certain offering as PAAS it should be cheaper than setting it up as IAAS.