On the contrary it still happens pretty regularly. See the one ESO contracted Blur to do. Their prices have not gone down.
You can see a small sample of their work recently here: http://www.blur.com/
Not that I'm disputing this, but how can you be so sure their prices have remained steady?
I've never dealt with Blur, but 3 other SFX houses that I have dealt with have gotten into heavy bidding wars over the last 2 years due to the proliferation of sub-sub-contracting on the super-cheap.