> I see several comments questioning the legitimate value
> of a peer-to-peer marketplace.
No, you see comments questioning the legitimate value of an anonymous or pseudonymous peer-to-peer marketplace.
Also, you misunderstand what eBay provides: eBay provides marketing and payment handling. That's what their margin is for. You are entirely welcome - today - to set up a webpage, list your wares, and accept Bitcoin for them. The problem is that there's little centralized reputation management there, and also, no-one is ever going to find your stuff. Unless a p2p marketplace is solving those needs, what benefit does it provide over nginx + a bitcoin wallet?
Also, you misunderstand what eBay provides: eBay provides marketing and payment handling. That's what their margin is for. You are entirely welcome - today - to set up a webpage, list your wares, and accept Bitcoin for them. The problem is that there's little centralized reputation management there, and also, no-one is ever going to find your stuff. Unless a p2p marketplace is solving those needs, what benefit does it provide over nginx + a bitcoin wallet?