Add CKYS to that list. People were still believing and buying on the grey market not only after the SEC suspension, but even after the CEO was arrested by the FBI and indicted with charges of criminal fraud with his mug shot posted in the iBox. He pled guilty and is serving over 8 years in a federal penitentiary. IR firm Big Apple Consulting was found guilty of all civil charges in the same matter.
Another notable is EDIG for the longevity of its cult following. Some people who bought in the multiple dollar range in 1999-2000 still post daily on its main discussion forum. The Diggers (aka EDIGistas) packed up and moved their discussion off of iHub when they could no longer delete posts at will.