This seems to be one of the better implementations I've seen, but this idea has been kicked around for years to no avail. I literally just finished talking to someone who is working on the exact same thing.
Keep in mind, Facebook already tried Marketplaces and that totally failed, even with an abundant lock on their target audience.
Thanks, yeah it's been hard so far but hopefully we struck a magic balance between trading and selling.
NOTE: the following is a rant because I love giving motivational speeches
BOX'NGO to me is not a startup or a business but a real solution to my own problems. I have 2 semesters' worth of textbooks just laying around and my girlfriend loves rubbing in my face how she sold her old ones to buy new ones.
I think about selling mine and I just hate the stress of it all. The process, the complications, finding the people, etc. in fact I've hated online selling but always wanted online selling. This is a solution to my own problems.
We might fail. The numbers hate us. But to me, the coder, my girlfriend the business idea person, and my other partner the people guy, this experience whether it be 2 weeks, 2 years, or the rest of our lives this is going to be a heck of an adventure.
Keep in mind, Facebook already tried Marketplaces and that totally failed, even with an abundant lock on their target audience.