I think a normal gamer, especially the one who has all this stuff in a different edition, wouldn't buy it. I think a normal player would get a different game instead of getting this new special edition of MGS games. But this doesn't count for big fans: they get every special edition released by Konami
And I think it's the same be for special editions of other games. Special editions are made for:
1- People who don't own the games yet and they want to play them all.
2- For big fans of the series.
Other would find it interesting, but they will probably spend their money in a different way...