I knew a couple of people who got fired after getting their org sucked into WebSphere. Long time ago but it does happen occasionally.
The quote I mentioned is just a quote, but it points to a part of a reason. If you are a CEO or a high level executive of a big company, going with IBM or Oracle is a safe bet. It's not very likely you will be blamed for failures of IBM or Oracle. It may be a money hole and bad for business but it's a much safer bet than going with some smaller vendor instead of big name vendors.