Pretty sure much like the Drog, Ade is pretty heavily involved with giving money back to his community. I doubt Ade will drop his wage demands enough for Spurs. He would need to accept less than 100k p/w, which I can't see him doing. Unless of course he gets a mutual termination with City, then he could do a Ballack and money saved in transfer is seen in wages.
Interesting how the Modric situation is developing looks like a win win for Spurs, either you keep him, he leaves and you get Sahin in return, or he leaves for a shed load and AVB moves in for Moutinho if the rumours are to be believed.