Sell poor quality coins
This is the worst online coin dealer. It sells left over coins after cherry picking, and advertised the coins as "brilliant uncirculated".
I have purchased about 4 times from them. The first two times had quality issues and they responded to my complaints after I supplied them with pictures of quality issues. They agreed to exchange these coins for me. I continued to do business with them. The forth time they still shipped me bad coins. I again sent them emails with pictures, and followed up two more times, without getting any response. Now I am disputing with PayPal trying to get my payment back. Very obviously, they sell the left over coins with quality problem after cherry picking out better ones for rating and higher prices.
Overall, don't use JM Bullion. It gets you in with very reasonable prices, but ships you bad quality products. Then customer service is not responsive after you complains a few times. This is a dishonest outfit.