zippy wrote:
Also another question. Why has Motion pictures Funnies Weekly not been collected before? Does marvel not own a copy of Namors first appearance?

Marvel/Timely did not put out that book, but it is probably in public domain.  At least the non-Subby stuff.

Namor's "first appearance in MPFW was quickly recycled as the first eight pages of the 12-page Sub-Mariner story in MARVEL COMICS #1.  You can tell that the last four pages were tacked on after the fact.