You are right, when someone tells you a price, it is their personal opinion of what price they would prefer. Based on your article and personal experience, I think the right price for Newton is $29.99/year. I used CloudMagic when it was free, and was very reluctant to pay $50 for the paid app. But when I saw a 50% off deal Newton offered me, that’s around the price that decided it would be worth the premium experience. Similarly I think the Evernote Plus tier is $34.99/year, and Toshl Pro budgeting app is $20.00/year. In my humble opinion, that is the best price for the mainstream for a premium app experience.