Why OODBMS, ORDBMS are not popular ?

Hi,
I just wanted to know that why OODBMS, ORDBMS are not popular as thought when it is introduce?
And also Oracle 11g is ORDBMS but the company/people usually don't use their OOPS feature. They mostly prefers the front end language like Java, .NET for feature that is in ORDBMS (Oracle 11g).
Why?
Regards,
AB

http://www.scribd.com/doc/29381874/Rdbms-Versus-Ordbms-Versus-Oodbms
Might provide an answer to some extent.

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