It makes sense for Spurs to cash in on him, double Player of the year, scored a decent amount of goals, flavour of the month.
Spurs, statistically are roughly the same in their win ratio with or without Bale, sell him and buy a few good players, but Levy, being Levy, will make Bale's position untenable, turn the fans against him, and sour his time there, he'd like to leave with a good relationship, but it looks like Levy has put paid to that, is he forcing him to hand in a transfer request? If I were Bale, I'd gladly fore go any bonus payments to play for Real Madrid, if it was "my dream"!