Amazed as well at how little value people place on digital goods. I've built a few apps & while 95% of people love them, we always get someone who decides for some reason that they want a $1 refund.
How many things out there do you blow $1 on and never think about it? Is it worth your time to claw back that type of money?
With most other things, you know what you are getting. With software, you are not sure.
For this one, specifically, I'm not sure if I want my wallpapers to change all the time. Maybe it would have network issues. Maybe it would show ads. Maybe it has something malicious in the code. Or maybe changing wallpapers would sometimes make it hard for you to see the icons on your desktop.
Do you really want to pay for something with all of these uncertainties? Besides, writing a python script that would do the same might take half an hour, but it would be fun and you would know exactly what it's doing. This is in contrast to making coffee, which - at least for me - is anything but.
It's $5. For what is essentially an infinite supply of high resolution photos of art. $5.
Yes, I know that you are special and you can replicate this with Perl + LWP to crawl and fetch these images and a cron job to blahblahblah [snore]
Stop that. $5. Artwork. And it exists and works right now! You can buy it with 1 click and have virtually unlimited art.
I honestly cannot relate to people who would so undervalue their time. For a Mac app. Honestly I wish I could pay the OP twice.