You clearly don't understand just how good VVD is, then.
With VVD you have a CB with presence, who is good in the air, more than comfortable with the ball at his feet, has good pace, brings the ball out and into the opponent's half, can hit 60/70 yard passes and is a constant threat at set pieces. IMO, he could play any position on the pitch and walk off, after 90 minutes, with MOTM.
Who do you think would be just as good for far less, then, because £70m should be the minimum price for a player with his skills.
If you were to get him for £50m, you would be back on here within 4 weeks of the season having started, telling us he was worth twice what you paid.