Oh hey, it's back. It was taken down for a period because the license expired. I guess it got renewed. Mickey's Castle of Illusion is another one that was disappearing, but it also seems to be back now.
$8 isn't exactly unreasonable, given that many of those games provide no less robust an experience than modern game releases (the same cannot be said for most NES games, since technical limitations of the NES era really held games back), but regardless of how they choose to price them, they are still selling them. Pricing decisions are their right as the content owner; resorting to piracy because you don't like the pricing really isn't morally defensible.
Earthbound is $10 on there and isn't even on Switch. That example is a moot point for me anyway since the last time I played that game was before virtual console was a thing anyway. ---