If framed properly (ie. this isn't Amazon quality, buyer beware!) this would be the single most exciting advance in commerce for myself.

99% of the friction of me selling used stuff I don't want or new stuff I produce is the shipping and money handling logistics.

I can't do Craigslist/Kijiji. I'm socially awkward and would rather throw away item X than risk the possibility of an awkward situation where someone's messing with me or trying to barter the price down, etc.