You are, of course, absolutely right. I'm personally a big fan of Enterprise DB (apart from the silly name). I think I'm biased in this because I work in a large consultancy, but it's often a hard sell. If you're even looking at EDB you've probably made two decisions
1. You want an RDBMS, but not Oracle
2. You want Enterprisey features and commercial support
Unless you've *also* made the decision that you really like Open Source software (which is still rare; accounting departments consider making purchasing decisions on ideology a sacking offence), EDB is principally competing with MS SQL (see another comment on this page about Postgres drawing mainly from MS SQL users, though sometimes the likes of Greenplum come into the mix too). The way things usually go at that point include some variations on a common theme:
1. Massive discounts on MS SQL because you're inevitably already an Exchange/AD/Office/Windows customer
2. Free professional services to grease the skids
3. A gentle nudge in the direction of the differences in scale between global Goliath MS, and relatively minor player EDB.
4. Oh, did we mention you get the reporting, ETL, management and development suites as part of the license too?
5. If all else fails point out it is ridiculously cheap when you do it right on Azure (hint: use the blob storage)
I've seen this happen loads of times now as people shift loads off their rapidly obsoleting multimillion pound/dollar/euro Teradata/Oracle installations. IBM try a similar play, but it usually falls flat because of the distinct air of Naff around their current products.
And now they can throw platform-agnosticity (is that even a word?) into the marketing mix. I strongly, strongly suspect if it wasn't for the enormous sunk costs in Apex/OBIEE etc., Oracle customers would be flocking to MS about now. We've already seen it from Teradata.