Not sure why anyone should care how he spends his own money, especially a dude who's given not only money but time to charitable ventures.
Additionally:
- This is content that will be referenced elsewhere, driving a lot more traffic to his businesses
- If he ends up being able to sell it, he really isn't going to be out of pocket (or if he is, he'll easily recoup the costs) and may even make a decent return.
- If it doesn't end up selling, he'll be able to melt it down and recoup the bulk of the costs... with the rest easily being generated by ad impressions
- He can afford it. Why is this considered extravagant, when other people's purchases aren't? Easy. It's all largely relative. 90k for a business stunt seems unsightly to you, because its an incredible amount of money to most of us but a lot of our purchases are also simply out of reach for those with more financial hardships.
Perhaps its time to stop worrying about what he's doing, and focus on the content itself. Personally, I found it informative and pretty entertaining.