I'm not familiar with them other than their signs. If I had to venture a guess, it would be that diabetes supplies prices are stupid marked up and some people get them subsidized through Medicare, etc. so aren't paying full price. They may have extra for what ever reason but no access to a secondary market so they sell an $20 item that they paid $2 for to an intermediary for $10 who then sells it for $15. Or something like that.

So everyone wins, except the tax payers, and who ever needs to navigate the circus act, and society at large. I'm not sure how Eli Lilly feels about it.