Diminishing returns on increasingly exponentially-priced cameras means that if you're paying for the very top tier, value is no longer a consideration.
Your average flagship smartphone camera is a Toyota Camry. It gets the job done. Upgrade to a high-end bridge camera or entry-level DSLR (phones have killed the bargain point-and-shoot market), and you're looking at something like a basic 328i; already more car than most people will ever need. Upgrading to the top end of the 35mm DSLR market is a bit like an AMG Mercedes; no one is going to make eyes at it unless they're looking for it, but it can competently handle pretty much any situation that you might normally encounter.
Going to medium format is like buying a supercar. Yes, it is better than every other option, but it's also an exercise in vanity- you don't buy a supercar because you need to accelerate the way a supercar does on a regular basis, but because there might be a situation where you need one, maybe two, of its advantages over the Mercedes.
So where does that leave the IQ180? It's a Bugatti Veyron Grand Sport Vitesse- a $2M exercise in masturbation that can only be used to its full capacity if you're willing to pay $42,000 for a set of tires that will burn through after 10 minutes at top speed.
No one buying a Veyron will hesitate to pay for the tires, because if you're buying a Veyron, there's no cost/benefit analysis that would keep you from it. No one buying an IQ180 will shy away from a computer to take advantage of its capabilities.