Neither Spurs or Dortmund currently pay any of their players close to that, and I don't see what's so special about Sancho for them to make an exception.
I dont know how true this but apparently spurs will be changing their wage structure come the summer as they are looking to invest heavily as their last two seasons have been poor. Now levys nit running the show either their wage structure eill be changing. They have the money so can afford to to.
Although i agree with you about sancho, this spurs they have a habit of sogning players for over the odds e.g gallagher simons, tel to name a few.
Its unlikely but on a free that would be typical spurs move.