Ah, OK, first of all, it's absolutely certain that all of those wouldn't be listed. They are "related sites": from the same entity, offering similar products. You can read the submittal policy to see what could well happen if you submit them all.
My guess without looking (which is all it is ethical for me to do now) is that the sites haven't even been looked at yet. If there is something unique there (I haven't looked, so I can't tell), then it is still pretty certain that there is nothing BLATANTLY unique (because mail-order memory products have been commonly offered for longer than the internet has been around.) So it's likely there are lots of competition, and ... nothing to choose between one and the other, and ... therefore not surprising if no editor has yet gotten around to these yet.
Beyond that, as I said, not ethical to go any more. However, if you make a request in the following form, "submitted
www.xxx.com to category xxx, but it really shouldn't have been submitted because it's a fraternal mirror of
www.yyy.com -- can you delete
www.xxx.com without prejudice to the submittal of www.yyy.com?" That I think we can do.
