1. Sales. Oracle will sell you not only the database engine, but also spec hardware, Cloud Control and similar things. Essentially they sell consulting and appl

1. Sales. Oracle will sell you not only the database engine, but also spec hardware, Cloud Control and similar things. Essentially they sell consulting and appliance in one package. This can sound like a good deal to management, detached from boots on the ground, in larger companies. 2. Support and guarantees. Postgres comes with no exrpress liabilities while Oracle offers some guarantees. Data loss being "their problem" can be a nice clause for business people. 3. Legacy projects. Migrating schemas between engines is usually doable exercise. Migrating application logic can be multi-year project for a decently sized, capable team. 3.1. Cross-project dependencies. Exchanging data via database rather than APIs is more common than one might think. Changing database engine in such circumstances becomes exponentially harder the more projects are involved.