Arguably "crazy expensive" software that minimizes crazy expensive hardware is something work considering. Firms pay 10s of times more for things like DataDog than they do for a KDB+ license.
Also I found the argument that KDB+ devs are expensive to be laughable once I saw how much (same, or even more) we started to pay AWS/Python devs.
Crazy expensive may be affordable to firms like JP Morgan, but other industries just won't pay that when Postgres is free. It's not as good for the kind of analysis Kdb+ does IMO, but free is free and it's easier to just get a VM from IT.
Also I found the argument that KDB+ devs are expensive to be laughable once I saw how much (same, or even more) we started to pay AWS/Python devs.