But if they're not buying things to buy bitcoin because they want to get returns off their bitcoin
I just explained why they would buy things. I said it twice, actually.
As a general thing because I found myself trying to justify my Gear Acquisition Syndrome -- it's a good idea to split services across devices, rather than having some monolithic home server (which is where most people start). That way if one box goes down, it doesn't take down your whole stack.
If you have some machines scattered about doing different things, it might be time to consider logically grouping services and splitting them across that hardware.
It was phrased as a question on purpose, to get you to think about it.
Your assertion is that no one would spend their Bitcoin on bread, and they'd instead use fiat currency. I'm asking you: why would they take their capital, regardless of what form it's in, and spend it on bread, if they knew they could hold onto that capital and it would appreciate in value?
The answer is very obvious: they need to eat.