If it will be for my job or my business, and I will be making money with that app, then you have to decide if the app is the only app available that does that particular task. I might be willing to pay several hundred $, assuming it has good performance, and good history (I am looking at architectural design software right now, and price would be (almost) no object. )
Due to sort of foreseen circumstances, no paid apps for awhile. Once things get back on track, not more than $10. I wound up not using Affinity Photo on either platform (iPad and Mac.) I'd rather spend the time watching tutorials on drawing really.
Totally depends on the type of app and my needs. For example I spent something like $50-$60 on OmniFocus for iOS (there were seperate apps for iPad and iPhone at the time), well worth it because I use OmniFocus several times a day.
I really don't like paying more than $5 because most apps get old fast, only a few that have been with me for awhile. And it pisses me off that you have to buy just to try most paid apps. You should either have a 30 day trial or limited functionality before you buy, then I would pay more maybe.
But for a business app that the profession has widely accepted, I imagine the sky is the limit. I pay $100 a month for a estimation app, and it is worth it.
It really depends on the app and the need but I just don’t like subscription model. I rather pay $100+ to own the app rather than ‘rent’ it.
And this is coming from a developer myself so don’t give me that crap about not supporting them.