This is just absurd! People need to use the tools in front of them when looking to purchase anything including apps. There are user reviews a star rating and other such tools available. People are lucky that there is a return policy at all. Much like other digital media that can be copied so can apps. There is no return policy on DVDs or music.: if you can't tell if an app works or not in 15 minutes you have more issues than just loosing $4.99.
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And that's why I stopped buying cds and dvds decades ago. Same reason I don't buy apps unless they are 10 cents. There are always alternative ways of getting them.