If I think of it in terms of paying full price for what is essentially a remaster of a single PSP game, then it seems a bit silly. Usually we'd get even more games for less money and I wouldn't touch it at full price unless i had nothing else to play
But when i look at it the other way, I've never played this game and i would have payed full price and more years ago to be able to play the PSP game. And now not only is it no longer a PSP game, or even my more hoped for version of a Vita or PS3 release. It's now a full on PS4 game so the it's coming out for the first time in my territory and the platform I'd want it most on.
With all the the desire I've put in over the years for this game to come out here on handheld, I've got no qualms paying full price for a console version on the newest generation