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Pro Objective-C Design Patterns for iOS by Carlo Chung

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Chapter 22. Proxy

It's a pretty common marketing strategy that lures people to buy something by offering a trial period without any obligation to pay for it. Sometimes even a 30-day money-back guarantee is not as powerful as a use-it-for-"free" offer. It works particularly well on some expensive items or online subscription services.

We know there are a lot of online dating sites that provide subscriptions to singles who want to find their partners. A lot of them are quite expensive—let's say $100 for three months of unlimited searching and communication with other members. It's expensive, and there is no guarantee that you will definitely find your perfect match after you pay $100 within three months. So a lot of dating sites provide free searches, ...

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