What is this transformerland.com ?

Like the title says. Can someone explain to me how this website, and thier ebay auctions work? They seem to have every single TF there is, and cheaper than everyone else. Is it a sham? Legit? Info please.
SEIBERTRON - Your Planet For Everything Transformers
https://www.seibertron.com/energonpub/
https://www.seibertron.com/energonpub/viewtopic.php?f=27&t=31600