If it helps some folks focus on tasks, it worth a lot more than a few dollars.
It's worth what people are willing to pay. Seems like there's quite a few people here happy with the price.
The app had a ranking of 50 in the productivity category June 8 and was out of the MAS US list June 11. Thats all for the last 365 days. So I guess not many is willing to pay. I salute the attempt fight the race to the bottom which the App Store has become, but I agree with OP, this app is probably not the standard-bearer. 9.99 for a TODO list (and judging from the video not very good) is too much. I mean, iStat Menus is 9.99 although amputated on the MAS.
You’d probably have an opportunity cost of more than that to recreate it, though.
I feel like if you really believed in this, having an egg timer might be better: existing solution, not bound to the computer, etc. The key addition is the label, I guess. I actually do use an egg timer when I need to
it's the prototypical app to build after "hello world"