Oracle does have its uses....
It keeps probably half the tech team at your average Mobile Operator in work....No I'm not kidding....
It is also a tangible entity that large companies can sue if something goes drastically wrong...
I guess what I'm saying is that things like choice of database, particualryl in large companies, are rarely goverend by technical suitability and moreoften for purely commercial/political reasons.
It all goes to show however what a smart move supporting both databases is...Oracle may make me wince, but it may also just swing the big contract, based on OpenACS.