This is actually a very common problem we see with our service. Tons of 1 star reviews in Play/iTunes because we dare to withhold (valuable) features in order to make enough profit to run the business. Once a week we get very very negative (read: swearing) emails to customer support about needing a paid account to do certain things. Kinda a shame, considering the sheer value we offer 98% of our free users because 2% actually pay.

Preaching to the choir I am sure :)