The reviews of both apps don't contain complaints about price — unless the app is not working for the customer, which is a pretty reasonable complaint.
Although I have never sold software at a higher price in the past, so I have nothing to compare with.
It sounds like you're an indie dev. You probably could charge more than $1.50/minute for your time ... so if you spend even five minutes supporting a customer, you're wiped out all your revenue (not even counting development time!).
Does not seem to have stopped other companies, from the Omni Group to Pixelmator. And didn't iA sold hundends of thousands of copies of it's editor when other editors where 1/5 to 1/10 the price? If it solves a need, people will pay for quality.
Not to mention that today's $10 correspond to 10 to 30 times more people using Macs than the times of $50-$100 email clients did.
I don't know. Some people still value quality and attention to detail. On my Android devices I'm using MailDroid pro, which is priced at around $20. And that's for a mobile app. But it's good enough for me to think that's worth it.
I'm paying $40 a year for Plex, and $180 for Spotify. I think that's good value too. I pay gladly.
Obviously there will be "cheapskates" always going for the cheapest option, but those people have always existed. Now they just have more & cheaper options and there's no way for a developer to escape that.
I guess they'll have to price that (smaller premium market) into the premium-price and hope it wont make it even smaller.
Since then I've come around considering lifetime subscription, but now they've upped the price for it a little more. And right now I have enough other things sucking up my funds.
In a perfect illustration of human irrationality, I will probably get around to it later.