It seems I interpreted as the attendants were wasting time and money. It seems you interpreted as Oracle wasting time and money. I agree with you that, for Oracle, this is a good form of promotion.
I'm thinking also that Oracle feels it is in a very powerful and dominant position, owning a whole stack, and they're letting everyone know it. It's not all bad though - like Apple and console makers, they can then integrate the stack to make a better whole product (and charge more for that greater value.) They can also charge more through lock-in, but doing that alone is a terrible long-term strategy, because it gives oxygen to new entrants.
Like "paranoia" Intel and "crown-stealing" Microsoft, I think Oracle well-understands that they won't keep their success automatically
I feel I've been a bit callously analytical, like the "Life goes on, folks" post near the end of A Fire Upon the Deep, but I'm not happy about how Oracle is acting, or what it may do next. Like the Blight, it is very powerful.