I suspect people know what they're getting out of that $4 cup of coffee. With a $1 app, it might end up being a waste of money.
Does the Apple Store have refunds? If a user could refund an app within 48 hours of purchase (no questions asked), might that increase sales? (An abrupt change in policy might negatively impact premium "one time use" apps though...)
I've bought cups of coffee that were bad enough to throw away for $4. Not often, but it's happened. It doesn't stop me from buying coffees from new cafes.
I reckon trying to solve this as though it's rationally thought-out is wrongheaded. I didn't consider and decide that I didn't like paying for apps, I just got used to not paying for apps. And indeed, once I got used to paying for apps again,* I stopped worrying about whether the $1 app would actually do what I wanted.
* Since we're sort of discussing what would prompt people to spend money, for me it was games. Free-to-play games are so reliably so annoying that I eventually swore off downloading them.
And many cups of coffee either taste bad or are bad for health, yet those customers still pay for those options and throw the cup away afterward. It's worth noting those cups of coffee typically cost more than $1.
Does the Apple Store have refunds? If a user could refund an app within 48 hours of purchase (no questions asked), might that increase sales? (An abrupt change in policy might negatively impact premium "one time use" apps though...)