[kipchak]

The only downsides to to the Steam marketplace is it hasn't caught on very much outside of Valve's own titles, and you can only cash out to store credit, which has resulted in third party trading sites that run on top of the steam marketplace to emerge such as marketplace.tf, which relies on trusting the site not to swindle you. Both of those are fairly small issues, I think the trickier part is creating an environment/reason for anyone to care about the digital items that are for sale.

[fattless]

Agreed. These all seem like problems that can be solved somewhat easily, this seems like a problem that has been solved already and others are trying to cram blockchain into it. Like I said, could be totally missing something though.