You'll need to outline the particular problem you have with those sellers.

I can't tell from the links.

One seller there though has lower feedback % than I would like and has a few telling negatives & I personally would steer clear, just on that. I see ebay has labelled that seller as outstanding so nope, I wouldn't expect to see ebay doing anything to them any time soon.

Is your problem with the items? Are they fakes? I wouldn't know.

The fact is if a seller doesn't have many claims made against them, they can probably avoid any restrictions. And as long as they don't go around cancelling sales too often, they are probably safe.

There are some sellers on ebay with a dreadful record but I have to admit, I have seen the same for some buyers. People who have given absolutely dozens of negatives in a row to almost every seller.  And some who just don't pay, time after time and yet nothing seems to happen to them.

I don't know, maybe it is about the money, can't see what else it could be. Ebay is as capable as we are at seeing problem buyers and sellers.