As explained earlier, this isn't someone taking a photograph and editing for hours, or an artist drawing for twenty hours on a piece of paper, or a chef making a bloody brilliant dish that you make for a contest. It's a manufacturer begging for your education, for your massive infusion of funds, for something no one every has asked in the industry for a completely lop-sided prize. Usually, the company puts up a contest, asks for great tries, and then give out prizes commensurate with the effort.
Here, we have a company that wants you to give away your technology. It's not a fecking souffle; it's hundreds if not thousands of hours that Hifman want from some dupe. They get free R&D. That does NOT happen anywhere. This is ridiculous.
This is in the first post: "...and there is a chance to have business cooperation."
I'll assume that means they are not going to just take your design and run away. They certainly seems very interested in taking the winning design into production - and the by 'cooperation', I'll assume it will be some kind of partnership where the designer either get an one-time payment or some sort of profit sharing.
There are actually a few individuals in China already make their own amp card and sold them online, ranging for $100~150 or so. Some are getting rave review from users as well. But almost all of them are limited run, from just a handful of boards to a few dozens or so, as they are mostly enthusiasts who have a day job and can't afford mass production (many kind of organized like a Kickstarter project over a few forums). The way I see it, this contest is probably aiming to draw those people out of the woods and turns those pet projects into official product. I doubt some senior engineer of some space agency will seriously want to win a pair of headphone so bad they are going to spend the time, money and effort to design an amp card.