Moneyball involves buying undervalued players. There's no chance Traore is being undervalued at 19m+ add ons. Lyon would have been happy to sell him for far less this summer.
Depay, for example, has been on a different planet to Traore for Lyon in terms of performance, and he'll be moving to Barca this week for a similar amount. Hopefully Traore works out for us but we're having our pants pulled down on the price again.