agreed with the bold.
risk with buying groups is they don't pay or decide not to take your product or product goes missing with a signature. but I would argue that risk is involved in many different business where you sell a product and send an invoice, client can mess you over in lots of industries. I was actually thinking of buying specialized insurance just for this reason.
The difference is that buying group buyers are not looking at this as a business move or doing any sort of risk assessment. Many are unaware that there is any risk at all. Some are singles in Yeshivah without income doing it for points, others are people living paycheck to paycheck also looking for a few extra points/dollars wherever they can get them. An article by Dan alerting them to the risks, even if the risks are lower than just swiping for someone, would be very beneficial, IMNSHO.