Unless they've been bought/taken down, I don't see any listings by the first user; as for the other, again unless you're referring to old listings, selling a mat for 2g doesn't really seem to be scamming. Unlike...hey, it's been a while since I checked, and whaddya know, there is indeed a Rainbow Sprite up there for 2500g. Although I wouldn't even swear to that one being a scam, since typically you used to see those posted just between the most expensive Nature and the cheapest Water.