Only the Salvage dupe was not that well known. I didn't even know about it until I got dragged into it once. I wouldn't be surprised if SE never heard of it before the ban.
Also, the Salvage dupe was exploiting a game bug. This is not. They entered the price that way. They may not have noticed all the ramifications, but it's not a bug. People are exploiting a known game mechanic instead of game vulnerability, that's all it is.