As I said, if he actually wants a move for family reasons (not simply because he is unhappy with the weather in England), I think the club would make a move easier for him by taking a lower than expected figure.
I honestly don't see anyone offering anywhere near £80m for Bernardo. He's a brilliant player, but for some strange reason, he flies below the radar in terms of media/pundit support when compared to English midfielders like Rice, Mount, Ward-Prowse etc.
As for the Richarlison figure; he's a different kettle of fish completely. Clubs will always pay over the odds for supposedly 'proven' strikers. He'll probably be a big hit at Spurs alongside Kane and Son.