Why? That's about what we stand to lose if we miss out on the Champions League again. Which we almost certainly will if we sell Harry Kane.
Not to mention, as frustrating as our club hierarchy has been over the past couple decades, I don't question them much on money. They know how to make boatloads of that at least.
Harry has been pretty clear that his preference would be to win trophies at Tottenham but if he can't do that, he will go somewhere else. Who knows, maybe Ange gets us to a cup final this year? We have plenty of talent going forward if we can fix the LCB and GK positions (We've already signed Vicario and Van de Ven but they were more up and comers than established stars). I don't mind betting on yourself to try and convince Harry to sign a new contract during the season. Hopefully we can surprise some people. Outside of Man City, I don't think the next 6 or 7 teams have all that much separation between them talent-wise.