I think you make a great point about perceived value of testing vs SEO/design. However, with the increased proliferation of downloading software through app stores, which favors apps with better reviews/ratings, the perceived value of testing should increase. For example, take a look at apps with mixed or low ratings on the AppStore and most of them will contain complaints about bugs in the app.
(random point + small shameless plug: I founded http://www.testelf.com as flat priced testing service for iOS apps)
(random point + small shameless plug: I founded http://www.testelf.com as flat priced testing service for iOS apps)