Are you sure there are two Vampi 1s at 9.4? The census only shows 1, which is double signed by Neal Adams (not a good thing IMO).
Like wpbooks01 said, I too am fascinated by the entire Frazetta CGC SS phenomenon. You can read my musings back and forth in the Frazetta Motherload post, which I highly suggest reading from the start if you haven't. I will just say that none of it really makes sense, but it doesn't have to. And this is what makes it interesting to observe and participate in. You can buy plenty of beautiful things with his signature on it (and a much better one at that) for much less money. Two examples are the death dealer lithos (1-1.5k) that come with beautiful, prime era, gold ink signatures on a high quality lithograph of his most famous work. You can also spend around 4k for one of his hand colored WF 29 prints that not only comes colored by his hand, but is hand signed with a prime era signature AND a unique remarque. So it is all about opportunity cost. I could never spend that amount for a commercial item like a magazine just for its signed cover. And, I currently own three Frazetta SS pieces so did drink the Kool-Aid a bit on these. But I won these at auction and am into them for around 1200 each. I can live with that.
To add to the "they aren't making any more of these" arguments, note also that the finite number he signed is declining. For example, a total manic opened one of the Tally Ho CGC SS pieces, if you can believe it. Pic of the corpse attached