I agree that it's too cheap, but that's the state of thee app store. There tons of other apps that do the same thing + more for free (I was building something like this to pick light colors with my HUE lights).
Yep. It's a sad state we're in. It's just too risky to pay more for an app from a publisher who is not well-known. All too often, installing an app for $3-5+ is disappointing when you discover the app is not what you were expecting. I rarely pay for apps, simply because I'd have paid thousands of dollars over the lifetime of a single phone, only to uninstall 95% of apps after discovering it was not for me.
Is an in-app purchase required to offer something tangible? Instead of using ads and offering an in-app purchase to remove ads, I'd love to see cheap apps (ie: free or $0.99, without ads) with options for in-app purchases - maybe $3, $5, $10, $20 - that are nothing more than a voluntary donation to pay more for an app I find worthwhile.
If I could volunteer to pay more for apps after using them for an extended period of time (fully unlocked, no trial gimmicks), I'd likely have spent a lot more money than I have thus far. I won't pay thousands for a bunch of crappy used-once apps, but I'd pay a few hundred for the bundle of apps I've kept.