I think the problem is no one is going to want to post “Hey, I work for Oakley, PM me for 1/3 off sunglasses” because then they’d be inundated with requests, have to deal with maintaining a spreadsheet with everyone’s username, address, and paypal info, track packages, etc. and then have their company come to them and ask why they bought 400 pairs of sunglasses at the discounted employee plan that they aren’t allowed to resell.
What would possibly work well is if we had a way to anonomyze people’s information. So that if I did work for Oakley, and got 70% off sunglasses, I could post it anonymously as ABC123 and list that this is what I have and I can do it 5 times before my company freaks out.
The cost savings might be $300 per person, and I did it 5 times, I saved other people $1500 dollars. I now have $1500 worth of “credit” to the site, so that I can use it to get $200 off auto parts, $500 off Disney tickets, $500 worth of Delta Skymiles, etc. This way everything is fair and not just a rush to get as much free/discounted stuff as you can take without giving back.
The site itself gets a 3% transaction cut somehow - perhaps the person buying the item has to pay 3% of the cost savings to the site to maintain operating costs.
This will all work great until the IRS finds out about it and gets involved.