I can't help but feel like he'll end up being a disappointment for them if he goes for that money. He's a great player no doubt, but at Spurs he is the main player. Every attack goes through him to either create or score the goals. Every player looks better if they are the main man. If he went to Madrid, there would still be Ronaldo and Ozil ahead of him in that front 4, and he would just be a winger for them, nothing more. As a normal winger in a team, would Bale have the same effect as he has for Spurs? I don't think he would, and there isn't much to suggest he would. He's never gotten many assists for Spurs, and he scored 25 goals last season for Spurs playing predominantly behind the striker.
Whatever happens, it looks like Spurs will get a ridiculous deal for him, and while they might be hurt at first losing a player like him, they can easily replace him with class players in positions they are currently lacking players in and strengthen overall. If I was a Spurs supporter in this situation, I'd be pretty happy that they'd be selling Bale for 90million or so. Crazy money.