I've seen companies buy a company Mercedes-Benz or BMW just to convince their clients that they have a good product. Some even buy a house with company money, justifying that they use it to pay themselves lower salaries and lower the tax they have to pay.
Both of those would get you in hot water with the IRS. And I wouldn't rule out the possibility that an investor would succeed in a lawsuit alleging breach of fiduciary duty.
There's a catch to it. They register "motivational talks" as one of the things the company does. So the expensive material success is subtracted from tax under advertising costs. A lot of those guys are management consultants who are good at this kind of thing.
It's not illegal or too irresponsible, just extremely cost-ineffective.
