I can remember in the sort of distant past having to take a brand new G550 to the blast fence (a brand new airplane leaking oil? Say it ain't so!) and the Captain/Manager was kind enough to come in run and taxi the darn airplane because I hadn't been trained to do either in this beautiful new monster (I've been lucky enough to truly experience the "brand new airplane smell" a few times) and I wasn't going to assume responsibility for it. So I got the airplane up and running on the APU, I aligned the IRUs and set up the ECS to cool because it was July in Van Nuys. When he finally arrived we had a quick brief, we'd get in, I'd shut the door, he'd start the engines and taxi out to the fence, I'd get out and give him a run her up signal and then look at the lower cowls for evidence of a leak while the engines were running "hard". This seemed like a good plan so we jumped in the airplane, I closed the door and settled into the right cockpit seat and expected to quickly taxi out. Nope, this dude was on his phone talking to someone and explaining his convoluted logic about preferring to rent a luxury apartment rather than owning a home. At that point I had a mortgage and I was probably making a 1/4 of what he was and I was dumbstruck with what I still consider irresponsible spending. And then he hung up the phone and we taxied out. It all went just fine but it reaffirmed my suspicion that very successful people aren't always very smart. I saw the same guy years later and he was still flying contract for large cabin Gulfstream clients. I'd like to say he was banking money but I suspect he was living like a pirate. I suppose it's a good life if you can maintain it, I can't imagine not having an actual "home".