Maybe it’s just because I’m a software developer, but it just about makes me cry when I see great apps with terrible reviews simply because the owners that own the app are trying to make a living. If you don’t like how much someone is charging for something at a restaurant, the proper response is to get something cheap and get out or don’t eat there. Those are your options. You don’t give it a one star review in Yelp for its pricing alone, do you?
If you download a freemium app, do yourself a favor and “read the menu”. It’s that little section down at the bottom of the app page that tells you what In-App purchases there are. If you don’t like those prices, find a different app.
App Store reviews should be for telling the developers and the rest of the world that the app works really or doesn’t. An app that performs really well that costs a lot shouldn’t be penalized for the owner’s decision to charge whatever they feel is fair. Find another medium to express your dissatisfaction with the pricing model. If the owner wants to put himself out of business by charging too much, that’s his prerogative. He or she will adjust based on simple supply and demand. Remember economics 101?