Interesting, though as this is a way to interface with Postgres I'm not sure your warnings about licensing costs are useful. Still, there are the other reasons you mentioned.
Some organisations won't allow use of a product unless there's a support option. I can understand this after a complete system failure a few years back on an open source unsupported product. I was hired to fix it! :) Mostly though in comes EnterpriseDB and support costs then. Problem is always staff availability here in the UK though so we always end up with SQL Server and Orscle bodies.