And the top comment is still valid - PixelFold appears to be a selection of designers from the Dribbble's front page and/or with large Dribbble follower count. If you have ever spent any time of D, you know that stuff that floats to the top is not exactly a real-life material, but shots specifically crafted to gather the likes. For example, Oykun guy is good, but half of his shots absolutely and utterly glance past UX in favor of the visuals. As such, his feedback is not something that I'd be interested in, leave alone paying for.
tl;dr - PixelFold's problem is not with the idea, it's with establishing credibility of those providing the feedback.
