This.
People getting up in arms because an app or keyboard is $3 annoys my especially when stopping for a $3 snack isn't even a second thought. The snack lasts 5 minutes people, the app/keyboard lasts "forever". Priorities you know.
The snack gives you energy and possibly nutrition depending on your choice to go about your day. The app lasts "forever" if you like it and the developers continue supporting and developing it successfully over years to come. However this is highly unlikely due to lots of possibilities and having no reassurance about either of those means people are more hesitant. It's quite simple to understand why and is quite a poor comparison.
With regards to getting up in arms about the pricing and your annoyance. People review apps all the time. Their set price point is part of the app and should also be considered in the review. For this if the full price had been around £1-£1.50 they'd probably have had a customer this morning. However, as they chose to price it around £5 they lost out on business and I don't seem to be the only one who thinks this way.
If your priorities are truly aimed at purchasing apps to test over feeding yourself - I think you seriously need to re-evaluate some things.
Disclaimer: This is purely opinion and talking about developers has no connection to Wrio.