This looks interesting, but I see it working only in theory.
At first, all the freebies on hotdeals are free anyhow. You can find this stuff easily on Google.
So I also do not see how more than maybe 1-3 clueless people on facebook could buy your background image for $5 when they also could get it for free on google within 1 minute.
Next thing, how can you even offer something for sale on a fb group, normally no admin approves this, and in no case if you are a new member who just joined.
And for physical items like on Vipon, how will you do this? They e.g. post a coupon for amazon. so you have it dropshipped from amazon to your buyer? I do not think you can use the code twice on one account, so you could only sell one and then would have to create a new amazon account for every sale???
Also they get the invoice from amazon, so they see the real price, the discount applied etc.
So like I said, looks great in theory, but ....