The richest and most elite don't deal with money themselves. They have people for that. When they go places everything is usually bought for them or else they wouldn't deign to show up. They are beyond needing to show off. Power and control is more important... sure money is a part of achieving that but they have 'been there done that' and not something they have much to do with directly anymore.
Those you are thinking of, no doubt, the ones you want to target, are the rich and elite wanna-be's...
the upper middle class mostly. Those who care a lot about money and want to use it to show that they are
among the best of the best.
Bitcoin represents an alternative asset that can act as money and is virtually untraceable. If a number of wealthy individuals used bitcoins for their own large transactions they could avoid taxes (not legally, but still they could hide money) and that makes bitcoins very appealing as a financial instrument.
Keep in mind, most rich people don't have a lot of money. They have a lot of wealth, and wealth can be in many forms. Managing wealth and transferring it between instruments is critical. And sloppiness could result in taxes.
Perhaps appealing to accountants of the rich is even better than targeting the rich, but I think it is naive to think that the rich don't care about managing their own money. You don't get there without knowing how to manage your wealth, and just handing the reigns over to someone to do it all for you is not an option. You get an account to as an adviser and person who fills in your paper work for you, but you still have to know the gist of the game.