"How much will the Wharfs foundations hold? And the ground they're on?"... as stated... infinite vertical load bearing capacity.

"How regular are it's piles?"... as regular as you want.

If they're several hundered meters apart, then it doesn't matter how strong they, but it does matter how strong the deck is".... ahhh, yes, but I think you may be thinking in the wrong direction.... reference your first question. The foundations and ground can, by definition in the original poser, bear an infinite vertical load.