how to encourage people to buy pro version of your application:

Only 49$ a year

@kaqqao the obnoxious popup is a pretty big turnoff, personally

I would (for some apps) actually pay for pro versions, but only if it's "pay and forget", and not like a rental. I'm not paying any amount of money every few *add time limit* just to be able to do what I want or get more out of it. Besides, I never have money on my account or IRL because I'm not old enough for a job.