Eh, all evidence of the past decade has not been them being overly cheap. I mean you can nit pick certain things, but there's also plenty of evidence of them spending lots (whether on teams, coaches, or operations/facilities) through the past decade+. Just because they weren't making the most expensive move every time doesn't mean they were cheap.
Fox/Fangio/Gase staff was surely expensive. HH renos a huge expense. Arlington a huge expense. Nagy I don't think was cheap and again paid up big to keep Fangio. Plenty of big deals and big offseasons in player spending. Eberflus was inexpensive, but reportedly Quinn was a finalist and would surely have been fairly expensive and all signs point to Poles just preferring Flus.
But yea now we can definitely put it to rest