How about a VNC client for when you occasionally want to remote into your home computer? Say you use it every two weeks.
Subscription price is $5/month ($60/year) because it's a professional tool for sysadmins who use it all the time. Maybe you'd have paid $30 for it standalone, but now if you want to use it for 3 years, the price is 6x as high (and the software poofs when you stop paying).
The line between professional tools and software I'd like to use for totally noncommercial purposes once every couple of weeks isn't always clear cut, and the pricing policies on the App Store have tended to keep things at an affordable mid-range where I can buy something even if it's only for occasional use. Subscription prices seem to get priced for the heavy professional users.
The solution I'm hoping for (carrying on the VNC example) is a free tier locked to a single connection, cheap tier with 5 saved connections, and professional tier for heavy users. But you just know the net effect of this is going to be prices going up (they wouldn't be doing it otherwise), and there are frankly a lot of things that aren't worth a recurring payment to keep around.
