Right, coffee is a (mostly fungible) commodity product that requires an investment of ~3-5 minutes of drinking time and you're done.

There's basically no opportunity cost to picking the "wrong" coffee. It won't take you longer to drink, will probably give you the same amount of caffeine and just won't taste quite as good as the "right" one.

Apps can require a significant time investment to learn/use them. There's also a potentially large opportunity cost to picking the wrong app. App store searching kind of blows, without some invested time, you can't even know which one is the "right" app for you to spend some time on. Though I also agree that 15-20 minutes is much more likely than hours of research.

The $2 isn't the point, it's the cost after the purchase that you're spending time to make sure it isn't wasted.