[layoric]

Even if you ignore the integration part and just leave it as a marketplace to trade/sell items, as yourself and others have pointed out, don't need a decentralized, public, cryptographically verifiable database (aka crypto/blockchain) for such an implementation.

Steam Community Market[0] pretty much a long running example of such a system, but it is missing one thing, you can't 'cash out' beyond your Steam wallet to spend on other items that aren't games or other virtual items. I think this is a valuable feature as it prevents the massive speculation on virtual goods that would absolutely ruin the ability to collect/use virtual goods for an economically efficient price.

Without it, I 100% believe artificial scarcity would prevail in search for the maximum value extraction.

[0] https://steamcommunity.com/market/