I would also contest your claim that a lot of the HN audience makes $200K a year. I’d wager that it’s a lot lesser.
And maybe that's the intent.
If you're not Apple, where price insensitive customers beat down your door, then finding them is a non-trivial problem. And not just any customers, but ones who would be interested in your (I assume) follow-on product in a similar space.
I was just offering the way I would approach considering to buy something like this
Personally, I don’t think this tool would make me significantly more productive, but if it could truly save me a few hours a year maybe 120/yr isn’t that bad.
Paying similar price for simple software? Well, I would expect something like one-time purchase for $10, that's how much I'm paying usually for those kinds of programs.
It might sound a little bit communistic, I know. Sorry.
If I'm making $20k/year, I could pay $10k for Intellij Idea. Because it's essential for my work. But I'm paying $90, because Idea creators put a reasonable price. May be that's because they're in a hard competition with free tools, I don't know.
Text editor for 30€ is a good business, everyone needs a text editor.
Database client for 30€ is probably a little less profitable, not as many people need that.
Client for a specific database like the protein data bank for 30€ -- well, you might sell two or three copies.
All of these are probably a similar amount of work, but you can't sell them for the same price.
That being said, a menu bar widget has such a huge market that I don't see why they are pricing it so high.
On the other hand, researching and trying out alternative free/cheaper tools might take hours. For a busy person making good money, $10/mo to make them more productive isn't a crazy ask IMO.