My brother is the CEO/Owner of a 60 person tech company that deals with the likes of Microsoft, Apple, Google etc.
He never wears a tie or jacket, but his clothing costs more than a high-quality suit. Most cruisers would consider him under-dressed for formal night.
His big show-off? He drives the BMW where the hard-shell roof retracts into the trunk.
On my last cruise on Carnival, the ship was FILLED with people well-qualified to fix the ships cable tv system, if you get my drift.