We used to use PostgreSql. But our CIO was able to negotiate very inexpensive Oracle licenses. Now we have a bunch of crappy databases that are a pain to upgrade. But we are saving a lot of money.
I mean, how can you know that even the worst postgresql installation wouldn't require only 10% of what you're paying now in contractors/support?
This like like how it's more economical for me to buy a top-end $100k Mercedes if I can negotiate a $10k savings off of MSRP, rather than a low-end $17k Toyota where I can only negotiate $500 off of the MSRP. See, with the Mercedes S-class, I'm saving $10k!!! I wouldn't save $10k with the Toyota... \s
But the CIO got to show off his negotiating skills.