He's sold a zillion of these, his feedback is just fine, even though he has a few negs and neutrals. Most of those N & N's are from buyers of bullion who think the coin should be perfect and not have any "dents" and such like.
This may very well be the best way to obtain new customers, too. Likely they have a well established follow up team for each sale that will contact you with other offers later.
But you have no worry about them, other than the fact that your bullion might not be MS-70.