Object database technology has never really taken off in the industry, but it has a lot of valid purposes, and in many scenarios can be very quick and powerful for developers to work with.

Relational databases carry a certain aura of reliability and reusability that make them appealing for businesses. Buying a pre-packaged product (whether it is a database, a reporting engine, an application server, or whatever) has a certain appeal to most businesses; the warm-blanket effect.