Interesting idea, but if the comment I read in the Tomshardware link is true, with only 25% going back to the seller, I doubt it will be worth it really. I would much prefer a system where games are bought and sold at market price, with a <5% fee, which could be split between the platform and game developers/publishers.
In the crypto world, even 5% is a large fee. But 75%? Forget it. Imagine if whenever a user transferred there ETH or BTC, or made a trade on an exchange, there was a fee that large. No one would do that.