i subscribe to hole19 for golf and figure i should switch to something cheaper but im happy with it.
outside of that, subscribing puts me off even trying an app. the most ive paid for an app recently is Clear, and its free to use totally, but you can buy extra fonts,themes, icons. i buy some themes because they look good, but i buy something everytime the app is updated and adds something good. i figure ill keep doing that.
i know we are all different, but for me personally, if an app charges me €3 ill happily pay it just to try it. if every time they upgraded it they popped up with a screen saying we cant charge you for an upgrade but if you want to pay €3 for something optional daft like a new icon, id do it just as a way of saying thanks for the continued work on the app.
worst thing is the pricing too, the amount of times i see apps wanting a monthly fee of around what i thought the app would be for a one off. charge me €3 a year subscription for what should be a €3 app and i can handle it, but not €3 a month.